From the Home screen, navigate: Settings > General > Language & Region.
Tap iPhone Language, tap a language then tap Done (located in the upper-right).
Selected when a check mark is present.
Tap Change to (selected language).
Tap Region, tap the region format then tap the Done (located in the upper-right).
Tap Calendar, tap the calendar type then tap Back (located in the upper-left).
Tap the Automatic switch to turn automatic region format on or off .
When turned on, the language for dates, times, and numbers is the same as the primary language.
Turn Automatic switch off to use a different language.