Fix carthage build minimum deployment target issue.

.swift-version

@@ -0,0 +1 @@
+5.0

Daylight.xcodeproj/project.pbxproj

@@ -53,6 +53,16 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		25455E7D2BEA51F500CABDF3 /* Daylight */ = {
+			isa = PBXGroup;
+			children = (
+				OBJ_9 /* Daylight.swift */,
+				5B402B651E9B29A20079BE20 /* DaylightUtilities.swift */,
+				5B402B671E9B29FF0079BE20 /* DaylightAstronomy.swift */,
+			);
+			path = Daylight;
+			sourceTree = "<group>";
+		};
 		OBJ_10 /* Tests */ = {
 			isa = PBXGroup;
 			children = (
@@ -92,22 +102,11 @@
 		OBJ_7 /* Sources */ = {
 			isa = PBXGroup;
 			children = (
-				OBJ_8 /* Daylight */,
+				25455E7D2BEA51F500CABDF3 /* Daylight */,
 			);
 			path = Sources;
 			sourceTree = "<group>";
 		};
-		OBJ_8 /* Daylight */ = {
-			isa = PBXGroup;
-			children = (
-				OBJ_9 /* Daylight.swift */,
-				5B402B651E9B29A20079BE20 /* DaylightUtilities.swift */,
-				5B402B671E9B29FF0079BE20 /* DaylightAstronomy.swift */,
-			);
-			name = Daylight;
-			path = Sources;
-			sourceTree = SOURCE_ROOT;
-		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -158,6 +157,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 			);
 			mainGroup = OBJ_5;
@@ -228,13 +228,20 @@
 				);
 				HEADER_SEARCH_PATHS = "$(inherited)";
 				INFOPLIST_FILE = Daylight.xcodeproj/Daylight_Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(TOOLCHAIN_DIR)/usr/lib/swift/macosx";
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = Daylight;
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+				SUPPORTED_PLATFORMS = "appletvos appletvsimulator iphoneos iphonesimulator macosx watchos watchsimulator";
+				SUPPORTS_MACCATALYST = NO;
+				TARGETED_DEVICE_FAMILY = "1,2";
 				TARGET_NAME = Daylight;
+				TVOS_DEPLOYMENT_TARGET = 16.0;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Debug;
 		};
@@ -248,13 +255,20 @@
 				);
 				HEADER_SEARCH_PATHS = "$(inherited)";
 				INFOPLIST_FILE = Daylight.xcodeproj/Daylight_Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(TOOLCHAIN_DIR)/usr/lib/swift/macosx";
+				MACOSX_DEPLOYMENT_TARGET = 11.0;
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = Daylight;
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+				SUPPORTED_PLATFORMS = "appletvos appletvsimulator iphoneos iphonesimulator macosx watchos watchsimulator";
+				SUPPORTS_MACCATALYST = NO;
+				TARGETED_DEVICE_FAMILY = "1,2";
 				TARGET_NAME = Daylight;
+				TVOS_DEPLOYMENT_TARGET = 16.0;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Release;
 		};
@@ -297,10 +311,12 @@
 			buildSettings = {
 				COMBINE_HIDPI_IMAGES = YES;
 				COPY_PHASE_STRIP = NO;
+				CURRENT_PROJECT_VERSION = 0.1.0;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				ENABLE_NS_ASSERTIONS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				ONLY_ACTIVE_ARCH = YES;
 				OTHER_SWIFT_FLAGS = "-DXcode";
@@ -309,7 +325,7 @@
 				SUPPORTED_PLATFORMS = "macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = SWIFT_PACKAGE;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 5.0;
 				USE_HEADERMAP = NO;
 			};
 			name = Debug;
@@ -319,17 +335,19 @@
 			buildSettings = {
 				COMBINE_HIDPI_IMAGES = YES;
 				COPY_PHASE_STRIP = YES;
+				CURRENT_PROJECT_VERSION = 0.1.0;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				GCC_OPTIMIZATION_LEVEL = s;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				OTHER_SWIFT_FLAGS = "-DXcode";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 				SUPPORTED_PLATFORMS = "macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator";
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = SWIFT_PACKAGE;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 5.0;
 				USE_HEADERMAP = NO;
 			};
 			name = Release;

Daylight.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Example/DaylightExample/DaylightExample.xcodeproj/project.pbxproj

@@ -123,6 +123,7 @@
 				TargetAttributes = {
 					5B7EA00A1EA84DC900B58F3A = {
 						CreatedOnToolsVersion = 8.2.1;
+						LastSwiftMigration = 0920;
 						ProvisioningStyle = Automatic;
 					};
 				};
@@ -339,7 +340,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.emergencestudios.DaylightExample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -353,7 +354,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.emergencestudios.DaylightExample;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -376,6 +377,7 @@
 				5B7EA01F1EA84DC900B58F3A /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 	};

Example/DaylightExample/DaylightExample/ViewController.swift

@@ -43,11 +43,11 @@ class ViewController: UIViewController {
         let date = Date()
         let loc = Location(tz: timeZone, coords: location.coordinate)
 
-        let sunrise = date.timeOf(.sunrise, at: loc)
-        let noon = date.timeOf(.noon, at: loc)
-        let sunset = date.timeOf(.sunset, at: loc)
-        let nextSunrise = date.timeOfNext(.sunrise, at: loc)
-        let nextSunset = date.timeOfNext(.sunset, at: loc)
+        let sunrise = try? date.timeOf(.sunrise, at: loc)
+        let noon = try? date.timeOf(.noon, at: loc)
+        let sunset = try? date.timeOf(.sunset, at: loc)
+        let nextSunrise = try? date.timeOfNext(.sunrise, at: loc)
+        let nextSunset = try? date.timeOfNext(.sunset, at: loc)
 
         let numberFormatter = NumberFormatter()
         numberFormatter.maximumFractionDigits = 3
@@ -58,11 +58,11 @@ class ViewController: UIViewController {
         let labelStrings = [
             "Lon: \(latString)º Lat: \(lonString)º",
             "Timezone: \(timeZone.identifier)",
-            "Sunrise: \(dateFormatter.string(from: sunrise))",
-            "Solar Noon: \(dateFormatter.string(from: noon))",
-            "Sunset: \(dateFormatter.string(from: sunset))",
-            "Next Sunrise: \(dateFormatter.string(from: nextSunrise))",
-            "Next Sunset: \(dateFormatter.string(from: nextSunset))"
+            "Sunrise: \(dateFormatter.string(from: sunrise!))",
+            "Solar Noon: \(dateFormatter.string(from: noon!))",
+            "Sunset: \(dateFormatter.string(from: sunset!))",
+            "Next Sunrise: \(dateFormatter.string(from: nextSunrise!))",
+            "Next Sunset: \(dateFormatter.string(from: nextSunset!))"
         ]
 
         for view in stackView.subviews {

Package.swift

@@ -1,5 +1,27 @@
+// swift-tools-version:5.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
 
 let package = Package(
-    name: "Daylight"
+    name: "Daylight",
+    platforms: [.iOS(.v13), .macOS(.v10_15)],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "Daylight",
+            targets: ["Daylight"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "Daylight",
+            dependencies: []),
+    ],
+    swiftLanguageVersions: [.v5]
 )

Sources/Daylight.swift → Sources/Daylight/Daylight.swift

@@ -8,6 +8,11 @@
 import Foundation
 import CoreLocation
 
+public enum SolarEventError: Error {
+    case neverRise
+    case neverSet
+}
+
 public enum SolarEvent {
     case sunrise
     case noon
@@ -59,69 +64,68 @@ public struct Day {
         self.day = day
     }
 
-    public func timeOf(_ solarEvent: SolarEvent, at location: Location) -> Date {
+    public func timeOf(_ solarEvent: SolarEvent, at location: Location) throws -> Date {
         let components = DateComponents(year: year, month: month, day: day)
         let calendar = Calendar.with(tz: location.tz)
         let inputDate = calendar.date(from: components)!
-        return inputDate.timeOf(solarEvent, at: location)
+        return try inputDate.timeOf(solarEvent, at: location)
     }
 }
 
 public extension Date {
 
-    public func timeOf(_ solarEvent: SolarEvent, at location: Location) -> Date {
+    func timeOf(_ solarEvent: SolarEvent, at location: Location) throws -> Date {
         switch solarEvent {
         case .sunrise, .civilDawn, .nauticalDawn, .astronomicalDawn:
-            return calculateDawn(location: location.coords,
-                                           solarElevation: solarEvent.elevation.rawValue,
-                                           timezone: location.tz)
+            return try calculateDawn(location: location.coords,
+                                 solarElevation: solarEvent.elevation.rawValue,
+                                 timezone: location.tz)
         case .sunset, .civilDusk, .nauticalDusk, .astronomicalDusk:
-            return calculateDusk(location: location.coords,
-                                           solarElevation: solarEvent.elevation.rawValue,
-                                           timezone: location.tz)
+            return try calculateDusk(location: location.coords,
+                                 solarElevation: solarEvent.elevation.rawValue,
+                                 timezone: location.tz)
         case .noon:
-            return calculateNoon(location: location.coords,
+            return try calculateNoon(location: location.coords,
                                  timezone: location.tz)
         }
     }
 
-    public func timeOfNext(_ solarEvent: SolarEvent, at location: Location) -> Date {
-        var time = self.timeOf(solarEvent, at: location)
+    func timeOfNext(_ solarEvent: SolarEvent, at location: Location) throws -> Date {
+        var time = try timeOf(solarEvent, at: location)
         if self >= time {
-            time = self.dayAfter.timeOf(solarEvent, at: location)
+            time = try dayAfter.timeOf(solarEvent, at: location)
         }
         return time
     }
 
     private func calculateDawn(location: CLLocationCoordinate2D,
                                solarElevation: Float64,
-                               timezone: TimeZone) -> Date {
+                               timezone: TimeZone) throws -> Date {
 
         let midnight = self.atMidnight(timeZone: timezone)
         let julianDate = midnight.julianTz(timezone)
-        let sunriseUTCMins = julianDate.sunriseUTC(location: location, solarElevation: solarElevation)
+        let sunriseUTCMins = try julianDate.sunriseUTC(location: location, solarElevation: solarElevation)
 
         return self.dateFromTimeUTC(timeUTCMins: sunriseUTCMins, timezone: timezone)
     }
 
     private func calculateDusk(location: CLLocationCoordinate2D,
                                solarElevation: Float64,
-                               timezone: TimeZone) -> Date {
+                               timezone: TimeZone) throws -> Date {
 
         let midnight = self.atMidnight(timeZone: timezone)
         let julianDate = midnight.julianTz(timezone)
-        let duskUTCMins = julianDate.sunsetUTC(location: location, solarElevation: solarElevation)
+        let duskUTCMins = try julianDate.sunsetUTC(location: location, solarElevation: solarElevation)
 
         return self.dateFromTimeUTC(timeUTCMins: duskUTCMins, timezone: timezone)
     }
 
     private func calculateNoon(location: CLLocationCoordinate2D,
-                               timezone: TimeZone) -> Date {
-
-        let sunrise = calculateDawn(location: location,
+                               timezone: TimeZone) throws -> Date {
+        let sunrise = try calculateDawn(location: location,
                                     solarElevation: SolarEvent.sunrise.elevation.rawValue,
                                     timezone: timezone)
-        let sunset = calculateDusk(location: location,
+        let sunset = try calculateDusk(location: location,
                                    solarElevation: SolarEvent.sunset.elevation.rawValue,
                                    timezone: timezone)
         let dayLength = sunset.timeIntervalSince(sunrise)