add all api to sort by month

Sources/App/Libraries/SwiftDate/DateInRegion/DateInRegion+Math.swift

@@ -0,0 +1,82 @@
+//
+//  SwiftDate
+//  Parse, validate, manipulate, and display dates, time and timezones in Swift
+//
+//  Created by Daniele Margutti
+//   - Web: https://www.danielemargutti.com
+//   - Twitter: https://twitter.com/danielemargutti
+//   - Mail: hello@danielemargutti.com
+//
+//  Copyright © 2019 Daniele Margutti. Licensed under MIT License.
+//
+
+import Foundation
+
+// MARK: - Math Operation DateInRegion - DateInRegion
+
+public func - (lhs: DateInRegion, rhs: DateInRegion) -> TimeInterval {
+	return lhs.timeIntervalSince(rhs)
+}
+
+// MARK: - Math Operation DateInRegion - Date Components
+
+public func + (lhs: DateInRegion, rhs: DateComponents) -> DateInRegion {
+	let nextDate = lhs.calendar.date(byAdding: rhs, to: lhs.date)
+	return DateInRegion(nextDate!, region: lhs.region)
+}
+
+public func - (lhs: DateInRegion, rhs: DateComponents) -> DateInRegion {
+	return lhs + (-rhs)
+}
+
+// MARK: - Math Operation DateInRegion - Calendar.Component
+
+public func + (lhs: DateInRegion, rhs: [Calendar.Component: Int]) -> DateInRegion {
+	let cmps = DateInRegion.componentsFrom(values: rhs)
+	return lhs + cmps
+}
+
+public func - (lhs: DateInRegion, rhs: [Calendar.Component: Int]) -> DateInRegion {
+	var invertedCmps: [Calendar.Component: Int] = [:]
+	rhs.forEach { invertedCmps[$0.key] = -$0.value }
+	return lhs + invertedCmps
+}
+
+// MARK: - Internal DateInRegion Extension
+
+extension DateInRegion {
+
+	/// Return a `DateComponent` object from a given set of `Calendar.Component` object with associated values and a specific region
+	///
+	/// - parameter values:    calendar components to set (with their values)
+	/// - parameter multipler: optional multipler (by default is nil; to make an inverse component value it should be multipled by -1)
+	/// - parameter region:    optional region to set
+	///
+	/// - returns: a `DateComponents` object
+	internal static func componentsFrom(values: [Calendar.Component: Int], multipler: Int? = nil, setRegion region: Region? = nil) -> DateComponents {
+		var cmps = DateComponents()
+		if region != nil {
+			cmps.calendar = region!.calendar
+			cmps.calendar!.locale = region!.locale
+			cmps.timeZone = region!.timeZone
+		}
+		values.forEach { pair in
+			if pair.key != .timeZone && pair.key != .calendar {
+				cmps.setValue( (multipler == nil ? pair.value : pair.value * multipler!), for: pair.key)
+			}
+		}
+		return cmps
+	}
+
+	/// Adds a time interval to this date.
+	/// WARNING:
+	/// This only adjusts an absolute value. If you wish to add calendrical concepts like hours,
+	/// days, months then you must use a Calendar.
+	/// That will take into account complexities like daylight saving time,
+	/// months with different numbers of days, and more.
+	///
+	/// - Parameter timeInterval: The value to add, in seconds.
+	public mutating func addTimeInterval(_ timeInterval: TimeInterval) {
+		date.addTimeInterval(timeInterval)
+	}
+}