Dell Mini 3v - Manual (Page 20)

5 Tap Save to save your changes and exit the Change time panel.
To use the 24-hour format:
1 Tap Settings from the Home screen to open the Settings screen.
2 In the Phone basics section, tap Date & time settings to open the Date & time settings screen.
3 Tap the Use 24-hour format check box to use 24-hour format.
To select the date format:
1 Tap Settings from the Home screen to open the Settings screen.
2 In the Phone basics section, tap Date & time settings to open the Date & time settings screen.
3 Tap Select date format to open the Select date format panel.
4 Tap the date format you prefer from the list.