Casio 1301 AQ-230 Post author By Post date 11th November 2021 All Questions & Answers › Casio 1301 AQ-230 0 Vote Up Vote Down Patrick asked 9 months ago Difference between 12HR and 24HR? How to set watch to change day and date display at midnight? Related 1 Answers 0 Vote Up Vote Down CasioFanMag Staff answered 9 months ago If you use 12HR format you need to choose P.M. for evening time and A.M. for morning time. Related ← Baby G bg-165 manual / user guide → Casio Edifice Ef 528 Batteriewechsel