Before using this guide, we recommend:

All settings are clearly explained and understandable.

How to set time on G-Shock GAC-100 Casio 5277-1

1. When the second hand is at 12 o’clock, pull the Crown out to Click 2.
2. Rotate the Crown to change the time setting.
3. Push the Crown back in.


  • Take care that you set the correct AM or PM time.
  • When changing the time, move the minute hand four or fi ve minutes past your fi nal setting, and then back it up to the setting you want.