fix date tests 3

Author: Alessio Arsuffi

Marvin/Date/Date.swift

@@ -32,8 +32,14 @@ public extension Date {
     /// - Parameter format: Date format (ex: "yyyy mm dd")
     ///    default: yyyy mm dd
     /// - Returns: a string from date
-    public func string(dateFormat format: String? = "yyyy MM dd") -> String {
+    
+    ///   - format: Date format (ex: "yyyy mm dd")
+    ///    default: yyyy mm dd
+    ///   - locale: locale identifier, default "it_IT"
+    /// - Returns: a string from date
+    public func string(dateFormat format: String? = "yyyy MM dd", locale: String = "it_IT") -> String {
         let dateFormatter = DateFormatter()
+        dateFormatter.locale = Locale(identifier: locale)
         dateFormatter.dateFormat = format
         return dateFormatter.string(from: self)
     }

MarvinTests/Date/DateTests.swift

@@ -31,7 +31,8 @@ class DateTests: XCTestCase {
             return
         }
 
-        let calendar = Calendar(identifier: .gregorian)
+        var calendar = Calendar(identifier: .gregorian)
+        calendar.locale = Locale(identifier: "it_IT")
         let components = calendar.dateComponents([.year, .month, .day], from: date)
 
         let day = components.day