add date format for Android

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 ### Enhancements
+- Add a `format` argument for `device_time` [#94](https://github.com/appium/ruby_lib_core/pull/94)
 
 ### Bug fixes
 

lib/appium_lib_core/device.rb

@@ -80,11 +80,15 @@ module Device
       # @!method device_time
       #   Get the time on the device
       #
-      # @return [String]
+      # @param [String] format The set of format specifiers. Read https://momentjs.com/docs/ to get the full list of supported
+      #                        datetime format specifiers. The default format is `YYYY-MM-DDTHH:mm:ssZ`,
+      #                        which complies to ISO-8601
+      # @return [String] Formatted datetime string or the raw command output if formatting fails
       #
       # @example
       #
-      #   @driver.device_time
+      #   @driver.device_time #=> "2018-06-12T11:13:31+02:00"
+      #   @driver.device_time "YYYY-MM-DD" #=> "2018-06-12"
       #
 
       ####
@@ -523,8 +527,10 @@ def shake
           end
 
           add_endpoint_method(:device_time) do
-            def device_time
-              execute :device_time
+            def device_time(format = nil)
+              arg = {}
+              arg[:format] = format unless format.nil?
+              execute :device_time, {}, arg
             end
           end
 

test/functional/android/android/device_test.rb

@@ -76,6 +76,11 @@ def test_device_time
         assert Date.parse(@@driver.device_time).is_a?(Date)
       end
 
+      def test_device_time_format
+        require 'date'
+        assert Date.parse(@@driver.device_time('YYYY-MM-DD')).is_a?(Date)
+      end
+
       def test_context_related
         @@core.wait { scroll_to('Views') }.click
         @@core.wait { scroll_to('WebView') }.click