My son's watch is the 1440 sports model. How do I get the time to switch from 24hr mode to regular 12hr mode? It's driving me crazy!

Hold down the MODE button until the time starts flashing. Then use the buttons to cycle through the time, date, and so forth until you see 24hr. On that menu tap the buttons you use to change the setting to cycle it to 12hr.

My watch has model number 504-tsk085, labeled Timex 1440 Sports, and Timex provides the incorrect manual for it online. I wrote these instructions after careful experiment:

Upper left button: press to switch to a stopwatch, or...

Press and hold to enter alarm setting mode. Once flashing press again to enter time/date setting mode.
-- you can only do one or the other without exiting the setting
mode (time or alarm set).
- within the setting mode you use the two right side buttons
in obvious ways to set times/dates
Exit setting mode by pressing upper left again

Lower left button: light
Upper right button (when not setting time): reveal date while pressed

Lower right button (when not setting time): reveal alarm time while pressed.

ALSO: WHILE lower right button is pressed you can change alarm
on/off and chime on/off through the four possible settings by
secondarily pressing the upper right button repeatedly.

I had 2 problems:
1- my watch was stuck in 24hr time format.
2- I didn't know how to turn the alarm off.

Solution for issue #1 (switching between 24hr and 12hr time displays):
You press both the upper right and lower left button at the same time's

Solution for issue #2 (turning alarm on/off):
You press both the upper right and lower right button at the same time, twice.

mcdevito75 here, You should be able to change from the MODE button, Here is Casio contact info, 800-706-2534 Optn. 2

Press Adjust / Hit Mode until the minutes or hours is flashing. either one will do. When on or the other is flashing press the "G" button for the light. This becomes the switch for 24hr/12hr.

My son's watch (WR 50M) broke... so I have a strap, if you'd like it.
He loved this watch and it would cost about the price of a new one to repair, so I'm buying him a new one. He's had the same watch for years... bless, huh?
If you anywhere I can purchase another WR 50M - 1440 Timex, I'd be most grateful.

Setting My Timex 1440 Sports Watch (4-button)
1. With the time and date showing, press the top left button.
2. Press the right top button (this sets seconds)
3. Press the bottom left button. This flashes the hour; press the top right button until you have the correct hour (there is no symbol for am, pm will show if pm).
4. Press the bottom left button, minutes flash. Press the top right button until correct minutes.
5. Press the bottom left button, month flashes. Press the top right button until correct.
6. Press bottom left button, date flashes. Press the top right button until correct.
7. Press bottom left button, day flashes. Press right top button until correct.
8. Press bottom left button, time format flashes ( now it can be set to 24 hour clock). If correct, you're done. Press top left button if you're done (can be pressed at any step if you're finished).

For setting Time & Date...
1. Push "MODE" button three times (change Mode to TimeSet)
Time -> StopWatch -> AlarmTimeSet -> TimeSet -> Time ->...
2. Flashing Second Number Digits
3. Push "RESET" to select...
Second -> Minute -> Hour(12hr<->24hr) ->...
Date -> Month -> Day of Week -> Second -> ....(repeat)
4. Use "START" to set each item...

For setting Alarm ON/OFF
1. Push "RESET" button then Push "START" same time...
Alarm ON -> Alarm OFF -> ... (repeat)

hello,to switch back and forth from 12 to 24hrs.:
push and hold lap/reset button and push the mode button,
an (A) will appear meaning it's in the 12hr zone,no (A) means 24hr.mode.

Hi I have a 1440 sport watch , somehow I got it into 24 hr mode vs regular time. Can't seem to figure outhow to get it out of this.....HELP :)