Fixing issue #717 - Get the total second from mm:ss format

Sources/SwiftDate/Date/Date.swift

@@ -57,6 +57,11 @@ extension Date: DateRepresentable {
 	public var dateComponents: DateComponents {
 		return region.calendar.dateComponents(DateComponents.allComponentsSet, from: self)
 	}
+
+    /// Get the total number of seconds in the registered 'time'.
+    public var totalSeconds: Int {
+        return ((hour * 60) + minute) * 60 + second;
+    }
 
 	/// Initialize a new date object from string expressed in given region.
 	///

Sources/SwiftDate/DateInRegion/DateInRegion.swift

@@ -30,6 +30,9 @@ public struct DateInRegion: DateRepresentable, Decodable, Encodable, CustomStrin
 	public var dateComponents: DateComponents {
 		return region.calendar.dateComponents(DateComponents.allComponentsSet, from: date)
 	}
+
+    /// Get the total number of seconds in the registered 'time'.
+    public var totalSeconds: Int
 
 	/// Description of the date
 	public var description: String {

Sources/SwiftDate/DateRepresentable.swift

@@ -52,6 +52,9 @@ public protocol DateRepresentable {
 
 	/// Second unit of the receiver.
 	var second: Int { get }
+
+    /// Total seconds of the receiver.
+    var totalSeconds: Int { get }
 
 	/// Nanosecond unit of the receiver.
 	var nanosecond: Int { get }

Sources/SwiftDate/Formatters/RelativeFormatter/langs/en.json

@@ -230,4 +230,4 @@
       "current" : "this qtr."
     }
   }
-}
+}