diff --git a/Package.swift b/Package.swift
index 9f2aacf..a14302a 100644
--- a/Package.swift
+++ b/Package.swift
@@ -7,8 +7,14 @@ let package = Package(
     products: [
         .library(name: "EasyDate", targets: ["EasyDate"]),
     ],
+    dependencies: [
+        .package(
+            url: "https://github.com/EasyPackages/EasyCore.git",
+            .upToNextMajor(from: "0.0.1")
+        )
+    ],
     targets: [
-        .target(name: "EasyDate"),
+        .target(name: "EasyDate", dependencies: ["EasyCore"]),
         .testTarget(
             name: "EasyDateTests",
             dependencies: ["EasyDate"]
diff --git a/Sources/EasyDate/DateFormatterExtensions.swift b/Sources/EasyDate/DateFormatterExtensions.swift
index a43ca78..029cb32 100644
--- a/Sources/EasyDate/DateFormatterExtensions.swift
+++ b/Sources/EasyDate/DateFormatterExtensions.swift
@@ -4,6 +4,7 @@
 //
 
 import Foundation
+import EasyCore
 
 ///
 /// A collection of reusable and localized `DateFormatter` configurations.
@@ -30,7 +31,7 @@ public extension DateFormatter {
         let f = DateFormatter()
         f.calendar = Calendar(identifier: .iso8601)
         f.timeZone = .gmt
-        f.locale = Locale(identifier: "en_US_POSIX")
+        f.locale = Locale.enUSPOSIX
         f.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXXXX"
         return f
     }
@@ -46,7 +47,7 @@ public extension DateFormatter {
     ///
     static var timestamp: DateFormatter {
         let f = DateFormatter()
-        f.locale = Locale(identifier: "en_US_POSIX")
+        f.locale = Locale.enUSPOSIX
         f.dateFormat = "yyyy-MM-dd HH:mm:ss"
         return f
     }
diff --git a/Sources/EasyDate/StringExtensions.swift b/Sources/EasyDate/StringExtensions.swift
index 88d79c3..b479cf9 100644
--- a/Sources/EasyDate/StringExtensions.swift
+++ b/Sources/EasyDate/StringExtensions.swift
@@ -106,7 +106,7 @@ public extension String {
         ]
         
         let formatter = DateFormatter()
-        formatter.locale = Locale(identifier: "en_US_POSIX")
+        formatter.locale = Locale.enUSPOSIX
         formatter.timeZone = .gmt
         
         for format in formats {
diff --git a/Tests/EasyDateTests/DateFormatterExtensionsTests.swift b/Tests/EasyDateTests/DateFormatterExtensionsTests.swift
index da42d23..3bad580 100644
--- a/Tests/EasyDateTests/DateFormatterExtensionsTests.swift
+++ b/Tests/EasyDateTests/DateFormatterExtensionsTests.swift
@@ -1,5 +1,6 @@
 import Testing
 import Foundation
+import EasyCore
 
 @testable import EasyDate
 
diff --git a/Tests/EasyDateTests/LocaleExtensions.swift b/Tests/EasyDateTests/LocaleExtensions.swift
deleted file mode 100644
index a2cc01c..0000000
--- a/Tests/EasyDateTests/LocaleExtensions.swift
+++ /dev/null
@@ -1,54 +0,0 @@
-import Foundation
-
-extension Locale {
-    static let zhCN = Locale(identifier: "zh_CN")
-    static let zhTW = Locale(identifier: "zh_TW")
-    static let enUS = Locale(identifier: "en_US")
-    static let enGB = Locale(identifier: "en_GB")
-    static let hiIN = Locale(identifier: "hi_IN")
-    static let esES = Locale(identifier: "es_ES")
-    static let esMX = Locale(identifier: "es_MX")
-    static let arEG = Locale(identifier: "ar_EG")
-    static let arSA = Locale(identifier: "ar_SA")
-    static let bnBD = Locale(identifier: "bn_BD")
-    static let bnIN = Locale(identifier: "bn_IN")
-    static let ptBR = Locale(identifier: "pt_BR")
-    static let ptPT = Locale(identifier: "pt_PT")
-    static let ruRU = Locale(identifier: "ru_RU")
-    static let jaJP = Locale(identifier: "ja_JP")
-    static let deDE = Locale(identifier: "de_DE")
-    static let jvID = Locale(identifier: "jv_ID")
-    static let koKR = Locale(identifier: "ko_KR")
-    static let frFR = Locale(identifier: "fr_FR")
-    static let frCA = Locale(identifier: "fr_CA")
-    static let trTR = Locale(identifier: "tr_TR")
-    static let viVN = Locale(identifier: "vi_VN")
-    static let itIT = Locale(identifier: "it_IT")
-    static let plPL = Locale(identifier: "pl_PL")
-    static let taIN = Locale(identifier: "ta_IN")
-    static let mrIN = Locale(identifier: "mr_IN")
-    static let teIN = Locale(identifier: "te_IN")
-    static let thTH = Locale(identifier: "th_TH")
-    static let guIN = Locale(identifier: "gu_IN")
-    static let urPK = Locale(identifier: "ur_PK")
-    static let urIN = Locale(identifier: "ur_IN")
-    static let paIN = Locale(identifier: "pa_IN")
-    static let faIR = Locale(identifier: "fa_IR")
-    static let roRO = Locale(identifier: "ro_RO")
-    static let ukUA = Locale(identifier: "uk_UA")
-    static let mlIN = Locale(identifier: "ml_IN")
-    static let knIN = Locale(identifier: "kn_IN")
-    static let myMM = Locale(identifier: "my_MM")
-    static let amET = Locale(identifier: "am_ET")
-    static let orIN = Locale(identifier: "or_IN")
-    static let azAZ = Locale(identifier: "az_AZ")
-    static let suID = Locale(identifier: "su_ID")
-    static let haNG = Locale(identifier: "ha_NG")
-    static let yoNG = Locale(identifier: "yo_NG")
-    static let neNP = Locale(identifier: "ne_NP")
-    static let siLK = Locale(identifier: "si_LK")
-    static let cebPH = Locale(identifier: "ceb_PH")
-    static let srRS = Locale(identifier: "sr_RS")
-    static let svSE = Locale(identifier: "sv_SE")
-    static let huHU = Locale(identifier: "hu_HU")
-}