From fd4a828ef0b86c6fca32acbe67012d2cd19b8728 Mon Sep 17 00:00:00 2001
From: Coronia <2217891145@qq.com>
Date: Wed, 26 Aug 2026 22:39:32 +0800
Subject: [PATCH 1/6] set mission timer type

---
 CREDITS.md                       |  1 +
 docs/AI-Scripting-and-Mapping.md | 26 ++++++++++++++++
 docs/Whats-New.md                | 17 ++++++-----
 src/Ext/Scenario/Body.cpp        |  3 ++
 src/Ext/Scenario/Body.h          |  7 +++++
 src/Ext/TAction/Body.cpp         | 23 ++++++++++++--
 src/Ext/TAction/Body.h           | 10 +++++--
 src/Misc/Hooks.UI.cpp            | 51 ++++++++++++++++++++++++++++++++
 8 files changed, 127 insertions(+), 11 deletions(-)

diff --git a/CREDITS.md b/CREDITS.md
index 36ad961727..b0ddbc6680 100644
--- a/CREDITS.md
+++ b/CREDITS.md
@@ -782,6 +782,7 @@ This page lists all the individual contributions to the project by their author.
   - Customize whether or not passenger can fire out when the transport is moving
   - Show game time
   - Fix a game crash when parsing string list with null entry
+  - `521` Set mission timer type
 - **NaotoYuuki** - Vertical & meteor trajectory projectile prototypes
 - **handama**:
   - AI script action to `16005 Jump Back To Previous Script`
diff --git a/docs/AI-Scripting-and-Mapping.md b/docs/AI-Scripting-and-Mapping.md
index 074d3917e2..b130c26124 100644
--- a/docs/AI-Scripting-and-Mapping.md
+++ b/docs/AI-Scripting-and-Mapping.md
@@ -716,6 +716,32 @@ ID=ActionCount,[Action1],512,0,0,[FollowerIndex],0,0,0,A,[ActionX]
 ...
 ```
 
+### `521` Set mission timer type
+
+- Set the method to display mission timer, the variable that should be displayed and if the timer should be displayed reversedly.
+  - `[Basic] -> InitTime` can be adjusted by `Timer Set...` action.
+  - If the local/global variable does not exist, 0 will be displayed.
+
+In `mycampaign.map`:
+```ini
+[Actions]
+...
+ID=ActionCount,[Action1],521,0,0,[ShowTimerMethod],[VariableIndex],[ReverseTimer],0,A,[ActionX]
+...
+```
+
+| *Behaviour* | *Description*                                  |
+| :---------: | :--------------------------------------------: |
+| 0           | Show normal timer                              |
+| 1           | show percentage based on `[Basic] -> InitTime` |
+| 2           | Show left timer in digit form                  |
+| 3           | Show value of the selected local variable      |
+| 4           | Show value of the selected global variable     |
+
+```{note}
+This won't affect how the global mission timer really ticks, so it'll still end after `[Basic] -> InitTime` amount of time.
+```
+
 ### `600` Configure Drop Crate
 
 - Set or overwrite the `DropCrate` of the affected objects.
diff --git a/docs/Whats-New.md b/docs/Whats-New.md
index 0cb4b0ff89..847ad016b6 100644
--- a/docs/Whats-New.md
+++ b/docs/Whats-New.md
@@ -263,20 +263,22 @@ HideShakeEffects=false           ; boolean
   502=Generate random number... (Phobos),0,56,57,58,54,0,0,0,0,[LONG DESC],0,1,502,1
   503=Print variable value... (Phobos),0,56,54,0,0,0,0,0,0,[LONG DESC],0,1,503,0
   504=Binary operation... (Phobos),0,56,55,60,54,59,0,0,0,[LONG DESC],0,1,504,1
-  505=Fire Super Weapon at specified location... (Phobos),0,0,20,2,21,22,0,0,0,Launch a Super Weapon from [SuperWeaponTypes] list at a specified location. House=-1 means random target that isn't neutral. House=-2 means the first neutral house. House=-3 means random human target. Coordinate X=-1 means random. Coordinate Y=-1 means random,0,1,505
-  506=Fire Super Weapon at specified waypoint... (Phobos),0,0,20,2,30,0,0,0,0,Launch a Super Weapon from [SuperWeaponTypes] list at a specified waypoint. House=-1 means random target that isn't neutral. House=-2 means the first neutral house. House=-3 means random human target. Coordinate X=-1 means random. Coordinate Y=-1 means random,0,1,506
-  510=Toggle MCV Redeployablility... (Phobos),0,0,15,0,0,0,0,0,0, Set MCVRedeploys to the given value,0,1,510
+  505=Fire Super Weapon at specified location... (Phobos),0,0,20,2,21,22,0,0,0,Launch a Super Weapon from [SuperWeaponTypes] list at a specified location. House=-1 means random target that isn't neutral. House=-2 means the first neutral house. House=-3 means random human target. Coordinate X=-1 means random. Coordinate Y=-1 means random.,0,1,505
+  506=Fire Super Weapon at specified waypoint... (Phobos),0,0,20,2,30,0,0,0,0,Launch a Super Weapon from [SuperWeaponTypes] list at a specified waypoint. House=-1 means random target that isn't neutral. House=-2 means the first neutral house. House=-3 means random human target. Coordinate X=-1 means random. Coordinate Y=-1 means random.,0,1,506
+  510=Toggle MCV Redeployablility... (Phobos),0,0,15,0,0,0,0,0,0,Set MCVRedeploys to the given value.,0,1,510
   511=Building Type undeploy at... (Phobos),-10,47,2,0,0,0,1,0,0,Recycle the building type into a vehicle and move it to the specified waypoint. If the type is `<All>`, recycle all buildings.,0,1,511
-  600=Configure dropped crate... (Phobos),0,72,31,0,0,0,0,0,0,Set or overwrite what crate is dropped when the attached object is destroyed. Only functions when used as attached triggers within objects. Behaviour -1=default. 1=Overwrites current crate. 0=Clear current crate,0,1,600
+  512=Set Follower for Associated Unit... (Phobos),0,0,73,0,0,0,0,0,0,Sets the follower for the associated object. The parameter is the index of the follower unit.,0,1,512
+  521=Set Mission Timer Type... (Phobos),0,0,73,48,74,0,0,0,0,Set the method to display mission timer, the variable that should be displayed and if the timer should be displayed reversedly. Method 0=default, 1=percentage, 2=digit, 3=local variable, 4=global variable.,0,1,521
+  600=Configure dropped crate... (Phobos),0,72,31,0,0,0,0,0,0,Set or overwrite what crate is dropped when the attached object is destroyed. Only functions when used as attached triggers within objects. Behaviour -1=default. 1=Overwrites current crate. 0=Clear current crate.,0,1,600
   606=Edit hate-value... (Phobos),0,2,55,6,0,0,0,0,0, Edit the hate-value that trigger houses to other houses. -1 works for all houses.,0,1,606
   607=Clear hate-value... (Phobos),0,2,0,0,0,0,0,0,0, Clear the hate-value that trigger houses to other houses. -1 works for all houses.,0,1,607
   608=Set force enemy... (Phobos),0,0,2,0,0,0,0,0,0, Force an enemy, it will not change with the change of hate-value. -1 will remove the forced enemy, -2 will never have any enemies.,0,1,608
   609=Set radar mode... (Phobos),0,0,15,0,0,0,0,0,0, Trigger's house can modify the current radar mode. 0 for requires full-power and building, 1 for free radar, 2 for forced enable, 3 for forced disable.,0,1,609
   610=Set team delay... (Phobos),0,0,6,0,0,0,0,0,0, Trigger's house can customize TeamDelay. When the value is less than 0 in [General] ->TeamDelays.,0,1,610
   611=Set next scenario... (Phobos),-4,105,0,0,0,0,0,0,0, Set the next campaign to load after winning the current one. Works only in Campaign Mode and requires setting [Basic] -> SkipMapSelect=yes.,0,1,611
-  800=Display banner and local variable... (Phobos),-4,101,104,102,103,3,0,0,0,Draw banner on screen and replace banner with same ID,0,1,800
-  801=Display banner and global variable... (Phobos),-4,101,104,102,103,35,0,0,0,Draw banner on screen and replace banner with same ID,0,1,801
-  802=Delete banner... (Phobos),0,104,0,0,0,0,0,0,0,Delete banner with ID,0,1,802
+  800=Display banner and local variable... (Phobos),-4,101,104,102,103,3,0,0,0,Draw banner on screen and replace banner with same ID.,0,1,800
+  801=Display banner and global variable... (Phobos),-4,101,104,102,103,35,0,0,0,Draw banner on screen and replace banner with same ID.,0,1,801
+  802=Delete banner... (Phobos),0,104,0,0,0,0,0,0,0,Delete banner with ID.,0,1,802
 
   ; FOLLOWING ENTRIES REQUIRE FA2SP.DLL (by secsome)
   [ScriptTypeLists]
@@ -422,6 +424,7 @@ HideShakeEffects=false           ; boolean
 - [Customized transport plane for teams](AI-Scripting-and-Mapping.md#customized-transport-plane-for-teams) (by FlyStar)
 - [Modify ammo on impact](New-or-Enhanced-Logics.md#modify-ammo-on-impact) (by FS-21)
 - [Customize whether mind-controlled Insignificant technos can be auto-targeted](Fixed-or-Improved-Logics.md#customize-whether-mind-controlled-Insignificant-technos-can-be-auto-targeted) (by Noble_Fish)
+- [`521` Set mission timer type](AI-Scripting-and-Mapping.md#set-mission-timer-type) (by Ollerus)
 
 #### Vanilla fixes:
 - Fixed the bug where a building with `Factory=BuildingType` owned by the AI did not play `ProductionAnim` when placing a produced building (by Noble_Fish)
diff --git a/src/Ext/Scenario/Body.cpp b/src/Ext/Scenario/Body.cpp
index b66a18b123..b82164cfbc 100644
--- a/src/Ext/Scenario/Body.cpp
+++ b/src/Ext/Scenario/Body.cpp
@@ -192,6 +192,9 @@ void ScenarioExt::ExtData::Serialize(T& Stm)
 		.Process(this->FallingDownTracker)
 		.Process(this->EVAIndex)
 		.Process(this->FiringAnimUpdateCount)
+		.Process(this->MissionTimer_Type)
+		.Process(this->MissionTimer_Variable)
+		.Process(this->MissionTimer_Reverse)
 		;
 }
 
diff --git a/src/Ext/Scenario/Body.h b/src/Ext/Scenario/Body.h
index af5d345682..88a8ee2034 100644
--- a/src/Ext/Scenario/Body.h
+++ b/src/Ext/Scenario/Body.h
@@ -52,6 +52,10 @@ class ScenarioExt
 
 		int FiringAnimUpdateCount;
 
+		int MissionTimer_Type;
+		int MissionTimer_Variable;
+		bool MissionTimer_Reverse;
+
 		ExtData(ScenarioClass* OwnerObject) : Extension<ScenarioClass>(OwnerObject)
 			, ShowBriefing { false }
 			, BriefingTheme { -1 }
@@ -71,6 +75,9 @@ class ScenarioExt
 			, FallingDownTracker {}
 			, EVAIndex { -2 }
 			, FiringAnimUpdateCount { 0 }
+			, MissionTimer_Type { 0 }
+			, MissionTimer_Variable { 0 }
+			, MissionTimer_Reverse { false }
 		{ }
 
 		static void SetVariableToByID(bool bIsGlobal, int nIndex, char bState);
diff --git a/src/Ext/TAction/Body.cpp b/src/Ext/TAction/Body.cpp
index 201e8dfef7..5d493fe8bb 100644
--- a/src/Ext/TAction/Body.cpp
+++ b/src/Ext/TAction/Body.cpp
@@ -65,13 +65,17 @@ bool TActionExt::Execute(TActionClass* pThis, HouseClass* pHouse, ObjectClass* p
 
 	case PhobosTriggerAction::ToggleMCVRedeploy:
 		return TActionExt::ToggleMCVRedeploy(pThis, pHouse, pObject, pTrigger, location);
-	case PhobosTriggerAction::SetDropCrate:
-		return TActionExt::SetDropCrate(pThis, pHouse, pObject, pTrigger, location);
 	case PhobosTriggerAction::UndeployToWaypoint:
 		return TActionExt::UndeployToWaypoint(pThis, pHouse, pObject, pTrigger, location);
 	case PhobosTriggerAction::SetFollowsIndexForVehicle:
 		return TActionExt::SetFollowsIndexForVehicle(pThis, pHouse, pObject, pTrigger, location);
 
+	case PhobosTriggerAction::SetMissionTimerType:
+		return TActionExt::SetMissionTimerType(pThis, pHouse, pObject, pTrigger, location);
+
+	case PhobosTriggerAction::SetDropCrate:
+		return TActionExt::SetDropCrate(pThis, pHouse, pObject, pTrigger, location);
+
 	case PhobosTriggerAction::EditAngerNode:
 		return TActionExt::EditAngerNode(pThis, pHouse, pObject, pTrigger, location);
 	case PhobosTriggerAction::ClearAngerNode:
@@ -777,6 +781,21 @@ bool TActionExt::SetNextScanario(TActionClass* const pThis, HouseClass* const pH
 	return true;
 }
 
+bool TActionExt::SetMissionTimerType(TActionClass* const pThis, HouseClass* const pHouse, ObjectClass* const pObject, TriggerClass* const pTrigger, const CellStruct& location)
+{
+	const int type = pThis->Param3;
+	const int reverse = pThis->Param5;
+	ScenarioExt::Global()->MissionTimer_Variable = pThis->Param4;
+	
+	if (0 <= type && 4 >= type)
+		ScenarioExt::Global()->MissionTimer_Type = type;
+
+	if (0 <= reverse && 1 >= reverse)
+		ScenarioExt::Global()->MissionTimer_Reverse = (bool)reverse;
+
+	return true;
+}
+
 static void CreateOrReplaceBanner(TActionClass* pTAction, bool isGlobal)
 {
 	const auto pBannerType = BannerTypeClass::Find(pTAction->Text);
diff --git a/src/Ext/TAction/Body.h b/src/Ext/TAction/Body.h
index 03f956755d..9696acb5f3 100644
--- a/src/Ext/TAction/Body.h
+++ b/src/Ext/TAction/Body.h
@@ -17,10 +17,13 @@ enum class PhobosTriggerAction : unsigned int
 	RunSuperWeaponAtLocation = 505,
 	RunSuperWeaponAtWaypoint = 506,
 	ToggleMCVRedeploy = 510,
-	SetDropCrate = 600,
 	UndeployToWaypoint = 511,
 	SetFollowsIndexForVehicle = 512,
 
+	SetMissionTimerType = 521,
+
+	SetDropCrate = 600,
+
 	EditAngerNode = 606,
 	ClearAngerNode = 607,
 	SetForceEnemy = 608,
@@ -81,10 +84,13 @@ class TActionExt final : public AbstractExt
 	ACTION_FUNC(RunSuperWeaponAtLocation);
 	ACTION_FUNC(RunSuperWeaponAtWaypoint);
 	ACTION_FUNC(ToggleMCVRedeploy);
-	ACTION_FUNC(SetDropCrate);
 	ACTION_FUNC(UndeployToWaypoint);
 	ACTION_FUNC(SetFollowsIndexForVehicle);
 
+	ACTION_FUNC(SetMissionTimerType);
+
+	ACTION_FUNC(SetDropCrate);
+
 	ACTION_FUNC(EditAngerNode);
 	ACTION_FUNC(ClearAngerNode);
 	ACTION_FUNC(SetForceEnemy);
diff --git a/src/Misc/Hooks.UI.cpp b/src/Misc/Hooks.UI.cpp
index c7d3c52847..919fd836c4 100644
--- a/src/Misc/Hooks.UI.cpp
+++ b/src/Misc/Hooks.UI.cpp
@@ -537,6 +537,7 @@ namespace DrawTimerTemp
 {
 	bool AdjustLocation = false;
 	bool IsPercentage = false;
+	bool IsDigit = false;
 	double Percentage = 0.0;
 	int TimeLeft = 0;
 }
@@ -552,6 +553,54 @@ DEFINE_HOOK(0x6D3D10, TacticalClass_Render_BeforeAll, 0x6)
 DEFINE_HOOK(0x6D4992, TacticalClass_Render_DrawMissionTimer_TimeLeft, 0x6)
 {
 	DrawTimerTemp::TimeLeft = R->EDX<int>();
+	DrawTimerTemp::IsPercentage = false;
+	DrawTimerTemp::IsDigit = false;
+
+	switch (ScenarioExt::Global()->MissionTimer_Type)
+	{
+	case 1:
+	{
+		const int initTime = ScenarioClass::Instance->InitTime;
+		if (ScenarioExt::Global()->MissionTimer_Reverse)
+			DrawTimerTemp::Percentage = initTime > 0 ? static_cast<double>(DrawTimerTemp::TimeLeft) / initTime : 1.0;
+		else
+			DrawTimerTemp::Percentage = initTime > 0 ? static_cast<double>(initTime - DrawTimerTemp::TimeLeft) / initTime : 1.0;
+		DrawTimerTemp::IsPercentage = true;
+		break;
+	}
+	case 2:
+	{
+		if (ScenarioExt::Global()->MissionTimer_Reverse)
+			DrawTimerTemp::TimeLeft = ScenarioClass::Instance->InitTime - DrawTimerTemp::TimeLeft;
+		DrawTimerTemp::IsDigit = true;
+		break;
+	}
+	case 3:
+	{
+		DrawTimerTemp::IsDigit = true;
+		const auto& variables = ScenarioExt::Global()->Variables[0];
+		const auto& it = variables.find(ScenarioExt::Global()->MissionTimer_Variable);
+		if (it != variables.end())
+			DrawTimerTemp::TimeLeft = it->second.Value;
+		break;
+	}
+	case 4:
+	{
+		DrawTimerTemp::IsDigit = true;
+		const auto& variables = ScenarioExt::Global()->Variables[1];
+		const auto& it = variables.find(ScenarioExt::Global()->MissionTimer_Variable);
+		if (it != variables.end())
+			DrawTimerTemp::TimeLeft = it->second.Value;
+		break;
+	}
+	default:
+	{
+		if (ScenarioExt::Global()->MissionTimer_Reverse)
+			DrawTimerTemp::TimeLeft = ScenarioClass::Instance->InitTime - DrawTimerTemp::TimeLeft;
+		break;
+	}
+	}
+
 	return 0;
 }
 
@@ -593,6 +642,8 @@ static int __fastcall TacticalClass_DrawTimer_swprintf(wchar_t* pBuffer, size_t
 
 	if (IsPercentage)
 		return swprintf(pBuffer, bufferCount, L"%.2lf%s", Percentage * 100, L"%%");
+	else if (IsDigit)
+		return swprintf(pBuffer, bufferCount, L"%d", TimeLeft);
 	else
 		return swprintf(pBuffer, bufferCount, L"%02d:%02d", TimeLeft / 60 % 60, TimeLeft % 60);
 }

From d7eb09c2a25898a2a657f6b7f5c8ec0ec5b16798 Mon Sep 17 00:00:00 2001
From: Coronia <2217891145@qq.com>
Date: Wed, 26 Aug 2026 22:40:52 +0800
Subject: [PATCH 2/6] fix doc

---
 docs/Whats-New.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/docs/Whats-New.md b/docs/Whats-New.md
index 847ad016b6..8ef7117936 100644
--- a/docs/Whats-New.md
+++ b/docs/Whats-New.md
@@ -205,6 +205,9 @@ HideShakeEffects=false           ; boolean
   70=AITargetTypes index,0
   71=AttachEffectType,0
   72=DropCrate Behavior,0
+  73=Unit Index,0
+  74=Mission Timer Type,0
+  75=Reverse Mission Timer,0
   101=BannerType,0
   102=Horizontal position,0
   103=Vertical position,0
@@ -268,7 +271,7 @@ HideShakeEffects=false           ; boolean
   510=Toggle MCV Redeployablility... (Phobos),0,0,15,0,0,0,0,0,0,Set MCVRedeploys to the given value.,0,1,510
   511=Building Type undeploy at... (Phobos),-10,47,2,0,0,0,1,0,0,Recycle the building type into a vehicle and move it to the specified waypoint. If the type is `<All>`, recycle all buildings.,0,1,511
   512=Set Follower for Associated Unit... (Phobos),0,0,73,0,0,0,0,0,0,Sets the follower for the associated object. The parameter is the index of the follower unit.,0,1,512
-  521=Set Mission Timer Type... (Phobos),0,0,73,48,74,0,0,0,0,Set the method to display mission timer, the variable that should be displayed and if the timer should be displayed reversedly. Method 0=default, 1=percentage, 2=digit, 3=local variable, 4=global variable.,0,1,521
+  521=Set Mission Timer Type... (Phobos),0,0,74,48,75,0,0,0,0,Set the method to display mission timer, the variable that should be displayed and if the timer should be displayed reversedly. Method 0=default, 1=percentage, 2=digit, 3=local variable, 4=global variable.,0,1,521
   600=Configure dropped crate... (Phobos),0,72,31,0,0,0,0,0,0,Set or overwrite what crate is dropped when the attached object is destroyed. Only functions when used as attached triggers within objects. Behaviour -1=default. 1=Overwrites current crate. 0=Clear current crate.,0,1,600
   606=Edit hate-value... (Phobos),0,2,55,6,0,0,0,0,0, Edit the hate-value that trigger houses to other houses. -1 works for all houses.,0,1,606
   607=Clear hate-value... (Phobos),0,2,0,0,0,0,0,0,0, Clear the hate-value that trigger houses to other houses. -1 works for all houses.,0,1,607

From 7ed91df2c14198e5ccb492b48071e45b6a169de4 Mon Sep 17 00:00:00 2001
From: Coronia <2217891145@qq.com>
Date: Thu, 27 Aug 2026 01:33:46 +0800
Subject: [PATCH 3/6] fix

---
 docs/AI-Scripting-and-Mapping.md | 16 ++++++++--------
 src/Misc/Hooks.UI.cpp            | 16 ++++++++++------
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/docs/AI-Scripting-and-Mapping.md b/docs/AI-Scripting-and-Mapping.md
index b130c26124..ba75726ee8 100644
--- a/docs/AI-Scripting-and-Mapping.md
+++ b/docs/AI-Scripting-and-Mapping.md
@@ -719,7 +719,7 @@ ID=ActionCount,[Action1],512,0,0,[FollowerIndex],0,0,0,A,[ActionX]
 ### `521` Set mission timer type
 
 - Set the method to display mission timer, the variable that should be displayed and if the timer should be displayed reversedly.
-  - `[Basic] -> InitTime` can be adjusted by `Timer Set...` action.
+  - Total mission timer length can be adjusted by `Timer Set...` action.
   - If the local/global variable does not exist, 0 will be displayed.
 
 In `mycampaign.map`:
@@ -730,13 +730,13 @@ ID=ActionCount,[Action1],521,0,0,[ShowTimerMethod],[VariableIndex],[ReverseTimer
 ...
 ```
 
-| *Behaviour* | *Description*                                  |
-| :---------: | :--------------------------------------------: |
-| 0           | Show normal timer                              |
-| 1           | show percentage based on `[Basic] -> InitTime` |
-| 2           | Show left timer in digit form                  |
-| 3           | Show value of the selected local variable      |
-| 4           | Show value of the selected global variable     |
+| *Behaviour* | *Description*                                       |
+| :---------: | :-------------------------------------------------: |
+| 0           | Show normal timer                                   |
+| 1           | show percentage based on total mission timer length |
+| 2           | Show left timer in digit form                       |
+| 3           | Show value of the selected local variable           |
+| 4           | Show value of the selected global variable          |
 
 ```{note}
 This won't affect how the global mission timer really ticks, so it'll still end after `[Basic] -> InitTime` amount of time.
diff --git a/src/Misc/Hooks.UI.cpp b/src/Misc/Hooks.UI.cpp
index 919fd836c4..6d0440728b 100644
--- a/src/Misc/Hooks.UI.cpp
+++ b/src/Misc/Hooks.UI.cpp
@@ -547,6 +547,7 @@ DEFINE_HOOK(0x6D3D10, TacticalClass_Render_BeforeAll, 0x6)
 	using namespace DrawTimerTemp;
 	AdjustLocation = false;
 	IsPercentage = false;
+	IsDigit = false;
 	return 0;
 }
 
@@ -555,23 +556,25 @@ DEFINE_HOOK(0x6D4992, TacticalClass_Render_DrawMissionTimer_TimeLeft, 0x6)
 	DrawTimerTemp::TimeLeft = R->EDX<int>();
 	DrawTimerTemp::IsPercentage = false;
 	DrawTimerTemp::IsDigit = false;
+	const auto& timer = ScenarioClass::Instance->MissionTimer;
+	const int timerPassed = (timer.CurrentTime - timer.StartTime) / 15;
 
 	switch (ScenarioExt::Global()->MissionTimer_Type)
 	{
 	case 1:
 	{
-		const int initTime = ScenarioClass::Instance->InitTime;
+		DrawTimerTemp::IsPercentage = true;
+		const int totalTime = timerPassed + DrawTimerTemp::TimeLeft;
 		if (ScenarioExt::Global()->MissionTimer_Reverse)
-			DrawTimerTemp::Percentage = initTime > 0 ? static_cast<double>(DrawTimerTemp::TimeLeft) / initTime : 1.0;
+			DrawTimerTemp::Percentage = totalTime > 0 ? static_cast<double>(DrawTimerTemp::TimeLeft) / totalTime : 1.0;
 		else
-			DrawTimerTemp::Percentage = initTime > 0 ? static_cast<double>(initTime - DrawTimerTemp::TimeLeft) / initTime : 1.0;
-		DrawTimerTemp::IsPercentage = true;
+			DrawTimerTemp::Percentage = totalTime > 0 ? static_cast<double>(totalTime - DrawTimerTemp::TimeLeft) / totalTime : 1.0;
 		break;
 	}
 	case 2:
 	{
 		if (ScenarioExt::Global()->MissionTimer_Reverse)
-			DrawTimerTemp::TimeLeft = ScenarioClass::Instance->InitTime - DrawTimerTemp::TimeLeft;
+			DrawTimerTemp::TimeLeft = timerPassed;
 		DrawTimerTemp::IsDigit = true;
 		break;
 	}
@@ -596,7 +599,7 @@ DEFINE_HOOK(0x6D4992, TacticalClass_Render_DrawMissionTimer_TimeLeft, 0x6)
 	default:
 	{
 		if (ScenarioExt::Global()->MissionTimer_Reverse)
-			DrawTimerTemp::TimeLeft = ScenarioClass::Instance->InitTime - DrawTimerTemp::TimeLeft;
+			DrawTimerTemp::TimeLeft = timerPassed;
 		break;
 	}
 	}
@@ -611,6 +614,7 @@ DEFINE_HOOK(0x6D4A10, TacticalClass_Render_DrawSuperTimer_PercentageTimer, 0x6)
 	GET(SuperClass*, pSuper, ECX);
 
 	DrawTimerTemp::IsPercentage = false;
+	DrawTimerTemp::IsDigit = false;
 	const int timeLeft = pSuper->RechargeTimer.GetTimeLeft();
 	const auto pSWTypeExt = SWTypeExt::Fetch(pSuper->Type);
 

From 5b79eb9840cca607ffabbc46cfa321f96b41ed82 Mon Sep 17 00:00:00 2001
From: Coronia <2217891145@qq.com>
Date: Thu, 27 Aug 2026 13:19:47 +0800
Subject: [PATCH 4/6] use fixed value for percentage and reversed timer

---
 docs/AI-Scripting-and-Mapping.md | 24 ++++++++++++------------
 docs/Whats-New.md                |  4 ++--
 src/Ext/TAction/Body.cpp         |  6 +++---
 src/Ext/TAction/Body.h           |  4 ++--
 src/Misc/Hooks.UI.cpp            |  8 +++-----
 5 files changed, 22 insertions(+), 24 deletions(-)

diff --git a/docs/AI-Scripting-and-Mapping.md b/docs/AI-Scripting-and-Mapping.md
index 3863fd2826..97da0c9c1d 100644
--- a/docs/AI-Scripting-and-Mapping.md
+++ b/docs/AI-Scripting-and-Mapping.md
@@ -716,27 +716,27 @@ ID=ActionCount,[Action1],512,0,0,[FollowerIndex],0,0,0,A,[ActionX]
 ...
 ```
 
-### `521` Set mission timer type
+### `521` Set mission timer properties
 
-- Set the method to display mission timer, the variable that should be displayed and if the timer should be displayed reversedly.
-  - Total mission timer length can be adjusted by `Timer Set...` action.
-  - If the local/global variable does not exist, 0 will be displayed.
+- Set the method to display mission timer and whether the timer should be displayed reversedly based on given value.
+  - For behaviours `0`, `1`, and `2`, the second parameter decides the base value for percentage timer type or reversed timer that'll be used for calculation.
+  - For behaviours `3` and `4`, the second parameter decides the index of variable that'll be displayed. If the local/global variable does not exist, 0 will be displayed.
 
 In `mycampaign.map`:
 ```ini
 [Actions]
 ...
-ID=ActionCount,[Action1],521,0,0,[ShowTimerMethod],[VariableIndex],[ReverseTimer],0,A,[ActionX]
+ID=ActionCount,[Action1],521,0,0,[MissionTimerType],[BaseValue or VariableIndex],[ReverseTimer],0,A,[ActionX]
 ...
 ```
 
-| *Behaviour* | *Description*                                       |
-| :---------: | :-------------------------------------------------: |
-| 0           | Show normal timer                                   |
-| 1           | show percentage based on total mission timer length |
-| 2           | Show left timer in digit form                       |
-| 3           | Show value of the selected local variable           |
-| 4           | Show value of the selected global variable          |
+| *Behaviour* | *Description*                              |
+| :---------: | :----------------------------------------: |
+| 0           | Show normal timer                          |
+| 1           | show percentage based on the given value   |
+| 2           | Show timer in digit form                   |
+| 3           | Show value of the selected local variable  |
+| 4           | Show value of the selected global variable |
 
 ```{note}
 This won't affect how the global mission timer really ticks, so it'll still end after the mission tiemr expired.
diff --git a/docs/Whats-New.md b/docs/Whats-New.md
index 099611b38b..4af32a509e 100644
--- a/docs/Whats-New.md
+++ b/docs/Whats-New.md
@@ -271,7 +271,7 @@ HideShakeEffects=false           ; boolean
   510=Toggle MCV Redeployablility... (Phobos),0,0,15,0,0,0,0,0,0,Set MCVRedeploys to the given value.,0,1,510
   511=Building Type undeploy at... (Phobos),-10,47,2,0,0,0,1,0,0,Recycle the building type into a vehicle and move it to the specified waypoint. If the type is `<All>`, recycle all buildings.,0,1,511
   512=Set Follower for Associated Unit... (Phobos),0,0,73,0,0,0,0,0,0,Sets the follower for the associated object. The parameter is the index of the follower unit.,0,1,512
-  521=Set Mission Timer Type... (Phobos),0,0,74,48,75,0,0,0,0,Set the method to display mission timer, the variable that should be displayed and if the timer should be displayed reversedly. Method 0=default, 1=percentage, 2=digit, 3=local variable, 4=global variable.,0,1,521
+  521=Set Mission Timer Properties... (Phobos),0,0,74,48,75,0,0,0,0,Set the method to display mission timer and whether the timer should be displayed reversedly based on given value. Method 0=default, 1=percentage based on given value, 2=digit, 3=local variable, 4=global variable.,0,1,521
   600=Configure dropped crate... (Phobos),0,72,31,0,0,0,0,0,0,Set or overwrite what crate is dropped when the attached object is destroyed. Only functions when used as attached triggers within objects. Behaviour -1=default. 1=Overwrites current crate. 0=Clear current crate.,0,1,600
   606=Edit hate-value... (Phobos),0,2,55,6,0,0,0,0,0, Edit the hate-value that trigger houses to other houses. -1 works for all houses.,0,1,606
   607=Clear hate-value... (Phobos),0,2,0,0,0,0,0,0,0, Clear the hate-value that trigger houses to other houses. -1 works for all houses.,0,1,607
@@ -428,7 +428,7 @@ HideShakeEffects=false           ; boolean
 - [Modify ammo on impact](New-or-Enhanced-Logics.md#modify-ammo-on-impact) (by FS-21)
 - [Customize whether mind-controlled Insignificant technos can be auto-targeted](Fixed-or-Improved-Logics.md#customize-whether-mind-controlled-Insignificant-technos-can-be-auto-targeted) (by Noble_Fish)
 - [AutoDeath based on player power status and player credits](New-or-Enhanced-Logics.md#kill-object-automatically) (by Flactine)
-- [`521` Set mission timer type](AI-Scripting-and-Mapping.md#set-mission-timer-type) (by Ollerus)
+- [`521` Set mission timer properties](AI-Scripting-and-Mapping.md#set-mission-timer-properties) (by Ollerus)
 
 #### Vanilla fixes:
 - Fixed the bug where a building with `Factory=BuildingType` owned by the AI did not play `ProductionAnim` when placing a produced building (by Noble_Fish)
diff --git a/src/Ext/TAction/Body.cpp b/src/Ext/TAction/Body.cpp
index 5d493fe8bb..7909b28b8e 100644
--- a/src/Ext/TAction/Body.cpp
+++ b/src/Ext/TAction/Body.cpp
@@ -70,8 +70,8 @@ bool TActionExt::Execute(TActionClass* pThis, HouseClass* pHouse, ObjectClass* p
 	case PhobosTriggerAction::SetFollowsIndexForVehicle:
 		return TActionExt::SetFollowsIndexForVehicle(pThis, pHouse, pObject, pTrigger, location);
 
-	case PhobosTriggerAction::SetMissionTimerType:
-		return TActionExt::SetMissionTimerType(pThis, pHouse, pObject, pTrigger, location);
+	case PhobosTriggerAction::SetMissionTimer:
+		return TActionExt::SetMissionTimer(pThis, pHouse, pObject, pTrigger, location);
 
 	case PhobosTriggerAction::SetDropCrate:
 		return TActionExt::SetDropCrate(pThis, pHouse, pObject, pTrigger, location);
@@ -781,7 +781,7 @@ bool TActionExt::SetNextScanario(TActionClass* const pThis, HouseClass* const pH
 	return true;
 }
 
-bool TActionExt::SetMissionTimerType(TActionClass* const pThis, HouseClass* const pHouse, ObjectClass* const pObject, TriggerClass* const pTrigger, const CellStruct& location)
+bool TActionExt::SetMissionTimer(TActionClass* const pThis, HouseClass* const pHouse, ObjectClass* const pObject, TriggerClass* const pTrigger, const CellStruct& location)
 {
 	const int type = pThis->Param3;
 	const int reverse = pThis->Param5;
diff --git a/src/Ext/TAction/Body.h b/src/Ext/TAction/Body.h
index 9696acb5f3..a2b1df7a0b 100644
--- a/src/Ext/TAction/Body.h
+++ b/src/Ext/TAction/Body.h
@@ -20,7 +20,7 @@ enum class PhobosTriggerAction : unsigned int
 	UndeployToWaypoint = 511,
 	SetFollowsIndexForVehicle = 512,
 
-	SetMissionTimerType = 521,
+	SetMissionTimer = 521,
 
 	SetDropCrate = 600,
 
@@ -87,7 +87,7 @@ class TActionExt final : public AbstractExt
 	ACTION_FUNC(UndeployToWaypoint);
 	ACTION_FUNC(SetFollowsIndexForVehicle);
 
-	ACTION_FUNC(SetMissionTimerType);
+	ACTION_FUNC(SetMissionTimer);
 
 	ACTION_FUNC(SetDropCrate);
 
diff --git a/src/Misc/Hooks.UI.cpp b/src/Misc/Hooks.UI.cpp
index 6d0440728b..fc4368eab1 100644
--- a/src/Misc/Hooks.UI.cpp
+++ b/src/Misc/Hooks.UI.cpp
@@ -556,15 +556,13 @@ DEFINE_HOOK(0x6D4992, TacticalClass_Render_DrawMissionTimer_TimeLeft, 0x6)
 	DrawTimerTemp::TimeLeft = R->EDX<int>();
 	DrawTimerTemp::IsPercentage = false;
 	DrawTimerTemp::IsDigit = false;
-	const auto& timer = ScenarioClass::Instance->MissionTimer;
-	const int timerPassed = (timer.CurrentTime - timer.StartTime) / 15;
 
 	switch (ScenarioExt::Global()->MissionTimer_Type)
 	{
 	case 1:
 	{
 		DrawTimerTemp::IsPercentage = true;
-		const int totalTime = timerPassed + DrawTimerTemp::TimeLeft;
+		const int totalTime = ScenarioExt::Global()->MissionTimer_Variable;
 		if (ScenarioExt::Global()->MissionTimer_Reverse)
 			DrawTimerTemp::Percentage = totalTime > 0 ? static_cast<double>(DrawTimerTemp::TimeLeft) / totalTime : 1.0;
 		else
@@ -574,7 +572,7 @@ DEFINE_HOOK(0x6D4992, TacticalClass_Render_DrawMissionTimer_TimeLeft, 0x6)
 	case 2:
 	{
 		if (ScenarioExt::Global()->MissionTimer_Reverse)
-			DrawTimerTemp::TimeLeft = timerPassed;
+			DrawTimerTemp::TimeLeft = ScenarioExt::Global()->MissionTimer_Variable - DrawTimerTemp::TimeLeft;
 		DrawTimerTemp::IsDigit = true;
 		break;
 	}
@@ -599,7 +597,7 @@ DEFINE_HOOK(0x6D4992, TacticalClass_Render_DrawMissionTimer_TimeLeft, 0x6)
 	default:
 	{
 		if (ScenarioExt::Global()->MissionTimer_Reverse)
-			DrawTimerTemp::TimeLeft = timerPassed;
+			DrawTimerTemp::TimeLeft = ScenarioExt::Global()->MissionTimer_Variable - DrawTimerTemp::TimeLeft;
 		break;
 	}
 	}

From db553f4b4501d9befc69544557dcd2e45357281e Mon Sep 17 00:00:00 2001
From: Coronia <2217891145@qq.com>
Date: Fri, 28 Aug 2026 12:22:43 +0800
Subject: [PATCH 5/6] applied feedbacks

---
 CREDITS.md                       | 2 +-
 docs/AI-Scripting-and-Mapping.md | 4 ++--
 docs/Whats-New.md                | 4 ++--
 src/Ext/TAction/Body.cpp         | 2 +-
 src/Ext/TAction/Body.h           | 3 +--
 src/Misc/Hooks.UI.cpp            | 4 ++++
 6 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/CREDITS.md b/CREDITS.md
index 104531b5a0..8359238971 100644
--- a/CREDITS.md
+++ b/CREDITS.md
@@ -786,7 +786,7 @@ This page lists all the individual contributions to the project by their author.
   - Customize whether or not passenger can fire out when the transport is moving
   - Show game time
   - Fix a game crash when parsing string list with null entry
-  - `521` Set mission timer type
+  - `513` Set mission timer type
 - **NaotoYuuki** - Vertical & meteor trajectory projectile prototypes
 - **handama**:
   - AI script action to `16005 Jump Back To Previous Script`
diff --git a/docs/AI-Scripting-and-Mapping.md b/docs/AI-Scripting-and-Mapping.md
index 97da0c9c1d..ee54363cb1 100644
--- a/docs/AI-Scripting-and-Mapping.md
+++ b/docs/AI-Scripting-and-Mapping.md
@@ -716,7 +716,7 @@ ID=ActionCount,[Action1],512,0,0,[FollowerIndex],0,0,0,A,[ActionX]
 ...
 ```
 
-### `521` Set mission timer properties
+### `513` Set mission timer properties
 
 - Set the method to display mission timer and whether the timer should be displayed reversedly based on given value.
   - For behaviours `0`, `1`, and `2`, the second parameter decides the base value for percentage timer type or reversed timer that'll be used for calculation.
@@ -731,7 +731,7 @@ ID=ActionCount,[Action1],521,0,0,[MissionTimerType],[BaseValue or VariableIndex]
 ```
 
 | *Behaviour* | *Description*                              |
-| :---------: | :----------------------------------------: |
+| :---------: | :----------------------------------------- |
 | 0           | Show normal timer                          |
 | 1           | show percentage based on the given value   |
 | 2           | Show timer in digit form                   |
diff --git a/docs/Whats-New.md b/docs/Whats-New.md
index e61759a8d3..7c388c3898 100644
--- a/docs/Whats-New.md
+++ b/docs/Whats-New.md
@@ -271,7 +271,7 @@ HideShakeEffects=false           ; boolean
   510=Toggle MCV Redeployablility... (Phobos),0,0,15,0,0,0,0,0,0,Set MCVRedeploys to the given value.,0,1,510
   511=Building Type undeploy at... (Phobos),-10,47,2,0,0,0,1,0,0,Recycle the building type into a vehicle and move it to the specified waypoint. If the type is `<All>`, recycle all buildings.,0,1,511
   512=Set Follower for Associated Unit... (Phobos),0,0,73,0,0,0,0,0,0,Sets the follower for the associated object. The parameter is the index of the follower unit.,0,1,512
-  521=Set Mission Timer Properties... (Phobos),0,0,74,48,75,0,0,0,0,Set the method to display mission timer and whether the timer should be displayed reversedly based on given value. Method 0=default, 1=percentage based on given value, 2=digit, 3=local variable, 4=global variable.,0,1,521
+  513=Set Mission Timer Properties... (Phobos),0,0,74,48,75,0,0,0,0,Set the method to display mission timer and whether the timer should be displayed reversedly based on given value. Method 0=default, 1=percentage based on given value, 2=digit, 3=local variable, 4=global variable.,0,1,521
   600=Configure dropped crate... (Phobos),0,72,31,0,0,0,0,0,0,Set or overwrite what crate is dropped when the attached object is destroyed. Only functions when used as attached triggers within objects. Behaviour -1=default. 1=Overwrites current crate. 0=Clear current crate.,0,1,600
   606=Edit hate-value... (Phobos),0,2,55,6,0,0,0,0,0, Edit the hate-value that trigger houses to other houses. -1 works for all houses.,0,1,606
   607=Clear hate-value... (Phobos),0,2,0,0,0,0,0,0,0, Clear the hate-value that trigger houses to other houses. -1 works for all houses.,0,1,607
@@ -430,7 +430,7 @@ HideShakeEffects=false           ; boolean
 - [AutoDeath based on player power status and player credits](New-or-Enhanced-Logics.md#kill-object-automatically) (by Flactine)
 - [Roof production anim](New-or-Enhanced-Logics.md#roof-production-anim) (by Noble_Fish)
 - [Customize whether the unit exits from the roof](Fixed-or-Improved-Logics.md#customize-whether-the-unit-exits-from-the-roof) (by Noble_Fish)
-- [`521` Set mission timer properties](AI-Scripting-and-Mapping.md#set-mission-timer-properties) (by Ollerus)
+- [`513` Set mission timer properties](AI-Scripting-and-Mapping.md#set-mission-timer-properties) (by Ollerus)
 
 #### Vanilla fixes:
 - Fixed the bug where a building with `Factory=BuildingType` owned by the AI did not play `ProductionAnim` when placing a produced building (by Noble_Fish)
diff --git a/src/Ext/TAction/Body.cpp b/src/Ext/TAction/Body.cpp
index 7909b28b8e..ac83d0b6f5 100644
--- a/src/Ext/TAction/Body.cpp
+++ b/src/Ext/TAction/Body.cpp
@@ -786,7 +786,7 @@ bool TActionExt::SetMissionTimer(TActionClass* const pThis, HouseClass* const pH
 	const int type = pThis->Param3;
 	const int reverse = pThis->Param5;
 	ScenarioExt::Global()->MissionTimer_Variable = pThis->Param4;
-	
+
 	if (0 <= type && 4 >= type)
 		ScenarioExt::Global()->MissionTimer_Type = type;
 
diff --git a/src/Ext/TAction/Body.h b/src/Ext/TAction/Body.h
index a2b1df7a0b..ab393241a4 100644
--- a/src/Ext/TAction/Body.h
+++ b/src/Ext/TAction/Body.h
@@ -19,8 +19,7 @@ enum class PhobosTriggerAction : unsigned int
 	ToggleMCVRedeploy = 510,
 	UndeployToWaypoint = 511,
 	SetFollowsIndexForVehicle = 512,
-
-	SetMissionTimer = 521,
+	SetMissionTimer = 513,
 
 	SetDropCrate = 600,
 
diff --git a/src/Misc/Hooks.UI.cpp b/src/Misc/Hooks.UI.cpp
index d57c16c938..901d1a4b82 100644
--- a/src/Misc/Hooks.UI.cpp
+++ b/src/Misc/Hooks.UI.cpp
@@ -583,6 +583,8 @@ DEFINE_HOOK(0x6D4992, TacticalClass_Render_DrawMissionTimer_TimeLeft, 0x6)
 		const auto& it = variables.find(ScenarioExt::Global()->MissionTimer_Variable);
 		if (it != variables.end())
 			DrawTimerTemp::TimeLeft = it->second.Value;
+		else
+			DrawTimerTemp::TimeLeft = 0;
 		break;
 	}
 	case 4:
@@ -592,6 +594,8 @@ DEFINE_HOOK(0x6D4992, TacticalClass_Render_DrawMissionTimer_TimeLeft, 0x6)
 		const auto& it = variables.find(ScenarioExt::Global()->MissionTimer_Variable);
 		if (it != variables.end())
 			DrawTimerTemp::TimeLeft = it->second.Value;
+		else
+			DrawTimerTemp::TimeLeft = 0;
 		break;
 	}
 	default:

From 72be9ccf9a5a0e310adc9eea26762888bce11a09 Mon Sep 17 00:00:00 2001
From: Coronia <2217891145@qq.com>
Date: Fri, 28 Aug 2026 15:04:21 +0800
Subject: [PATCH 6/6] remove space

---
 src/Ext/TAction/Body.cpp | 1 -
 src/Ext/TAction/Body.h   | 1 -
 2 files changed, 2 deletions(-)

diff --git a/src/Ext/TAction/Body.cpp b/src/Ext/TAction/Body.cpp
index ac83d0b6f5..aeac5594dd 100644
--- a/src/Ext/TAction/Body.cpp
+++ b/src/Ext/TAction/Body.cpp
@@ -69,7 +69,6 @@ bool TActionExt::Execute(TActionClass* pThis, HouseClass* pHouse, ObjectClass* p
 		return TActionExt::UndeployToWaypoint(pThis, pHouse, pObject, pTrigger, location);
 	case PhobosTriggerAction::SetFollowsIndexForVehicle:
 		return TActionExt::SetFollowsIndexForVehicle(pThis, pHouse, pObject, pTrigger, location);
-
 	case PhobosTriggerAction::SetMissionTimer:
 		return TActionExt::SetMissionTimer(pThis, pHouse, pObject, pTrigger, location);
 
diff --git a/src/Ext/TAction/Body.h b/src/Ext/TAction/Body.h
index ab393241a4..c054bd67b0 100644
--- a/src/Ext/TAction/Body.h
+++ b/src/Ext/TAction/Body.h
@@ -85,7 +85,6 @@ class TActionExt final : public AbstractExt
 	ACTION_FUNC(ToggleMCVRedeploy);
 	ACTION_FUNC(UndeployToWaypoint);
 	ACTION_FUNC(SetFollowsIndexForVehicle);
-
 	ACTION_FUNC(SetMissionTimer);
 
 	ACTION_FUNC(SetDropCrate);