Fix issues about weekday & monthday calculating

.codecov.yml

@@ -2,4 +2,5 @@ ignore:
   - "Tests/"
   - "Schedule.playground"
 
-comment: off
+comment:
+  layout: header, changes, diff

Sources/Schedule/Schedule.swift

@@ -268,6 +268,9 @@ extension Schedule {
             }
         }
     }
+}
+
+extension Schedule {
 
     /// Creates a schedule that executes the task immediately.
     public static var now: Schedule {
@@ -286,17 +289,17 @@ extension Schedule {
         }
     }
 
-    /// Creates a schedule that executes the task at the specific date.
-    public static func at(_ date: Date) -> Schedule {
-        return Schedule.of(date)
-    }
-
     /// Creates a schedule that executes the task after delay then repeat
     /// every interval.
     public static func after(_ delay: Interval, repeating interval: Interval) -> Schedule {
         return Schedule.after(delay).concat(Schedule.every(interval))
     }
 
+    /// Creates a schedule that executes the task at the specific date.
+    public static func at(_ date: Date) -> Schedule {
+        return Schedule.of(date)
+    }
+
     /// Creates a schedule that executes the task every period.
     public static func every(_ period: Period) -> Schedule {
         return Schedule.make { () -> AnyIterator<Interval> in
@@ -337,20 +340,15 @@ extension Schedule {
 
         /// Returns a schedule at the specific time.
         public func at(_ time: Time) -> Schedule {
-            return Schedule.make { () -> AnyIterator<Date> in
-                let iterator = self.schedule.dates.makeIterator()
-                let calendar = Calendar.gregorian
-                var last: Date!
+            var interval = time.intervalSinceZeroClock
+            return Schedule.make { () -> AnyIterator<Interval> in
+                let it = self.schedule.makeIterator()
                 return AnyIterator {
-                    last = last ?? Date()
-                    guard let date = iterator.next(),
-                        let next = calendar.nextDate(after: date.zeroClock(),
-                                                     matching: time.toDateComponents(),
-                                                     matchingPolicy: .strict) else {
-                        return nil
+                    if let next = it.next() {
+                        defer { interval = 0.nanoseconds }
+                        return next + interval
                     }
-                    defer { last = next }
-                    return next
+                    return nil
                 }
             }
         }
@@ -392,7 +390,7 @@ extension Schedule {
             var date: Date!
             return AnyIterator<Date> {
                 if weekday.isToday {
-                    date = Date()
+                    date = Date().zeroClock()
                 } else if date == nil {
                     date = calendar.nextDate(after: Date(), matching: components, matchingPolicy: .strict)
                 } else {
@@ -423,7 +421,7 @@ extension Schedule {
             var date: Date!
             return AnyIterator<Date> {
                 if monthDay.isToday {
-                    date = Date()
+                    date = Date().zeroClock()
                 } else if date == nil {
                     date = calendar.nextDate(after: Date(), matching: components, matchingPolicy: .strict)
                 } else {

Tests/ScheduleTests/SchedulesTests.swift

@@ -21,6 +21,10 @@ final class SchedulesTests: XCTestCase {
         let s3 = Schedule.from([d0, d1, d2, d3])
         XCTAssertTrue(s2.makeIterator().isAlmostEqual(to: intervals, leeway: leeway))
         XCTAssertTrue(s3.makeIterator().isAlmostEqual(to: intervals, leeway: leeway))
+
+        let longTime = (100 * 365).days
+        XCTAssertTrue(Schedule.distantPast.makeIterator().next()!.isLonger(than: longTime))
+        XCTAssertTrue(Schedule.distantFuture.makeIterator().next()!.isLonger(than: longTime))
     }
 
     func testDates() {
@@ -93,7 +97,7 @@ final class SchedulesTests: XCTestCase {
     }
 
     func testEveryPeriod() {
-        let s = Schedule.every(1.year).first(10)
+        let s = Schedule.every("1 year").first(10)
         var date = Date()
         for i in s.dates {
             XCTAssertEqual(i.dateComponents.year!, date.dateComponents.year! + 1)
@@ -104,17 +108,17 @@ final class SchedulesTests: XCTestCase {
     }
 
     func testEveryWeekday() {
-        let s = Schedule.every(.friday).at("11:11:00").first(5)
+        let s = Schedule.every(.friday, .monday).at("11:11:00").first(5)
         for i in s.dates {
-            XCTAssertEqual(i.dateComponents.weekday, 6)
+            XCTAssertTrue(i.dateComponents.weekday == 6 || i.dateComponents.weekday == 2)
             XCTAssertEqual(i.dateComponents.hour, 11)
         }
     }
 
     func testEveryMonthday() {
-        let s = Schedule.every(.april(1)).at(11, 11).first(5)
+        let s = Schedule.every(.april(1), .october(1)).at(11, 11).first(5)
         for i in s.dates {
-            XCTAssertEqual(i.dateComponents.month, 4)
+            XCTAssertTrue(i.dateComponents.month == 4 || i.dateComponents.month == 10)
             XCTAssertEqual(i.dateComponents.day, 1)
             XCTAssertEqual(i.dateComponents.hour, 11)
         }