Begin statistics creation

CHDataManagement/Workouts/Date+Days.swift

@@ -0,0 +1,15 @@
+import Foundation
+
+extension Date {
+    
+    func inclusiveDays(to other: Date, calendar: Calendar = .current) -> Int {
+        let startDay = calendar.startOfDay(for: self)
+        let endDay = calendar.startOfDay(for: other)
+
+        guard let days = calendar.dateComponents([.day], from: startDay, to: endDay).day else {
+            return 0
+        }
+
+        return abs(days) + 1
+    }
+}