You can easily set date and time on Samsung Galaxy S4. You can also choose to automatically set date and time, based on network provided time zone or select time zone by your own. To enter to the Date & Time settings, do as follows:
1. Open "Settings" App
2. Tap "More" tab and select "Date and Time"
3. Mark "Automatic date and Time" to use network-provided time. Otherwise you should set the current date & time manually.
4. If you unmark the "Automatic time zone" option, then you need to set the time zone manually
5. You can also choose the Time & Date displaying format
Read More Galaxy S4 Tips and Tricks