ON my older Timex digitial, when I push the Start/Stop button, the watch resets. I lose the time setting. The watch no longer works as a stopwatch. Is this fixable? If so, how?

https://www.timex.com/watch-manuals.html
Timex offers guides, above.
The one stopwatch they show my provide enough info for you to figure out how to work your watch.

hi Janet.
You may also need to change the time when traveling or to adjust for daylight saving time.

1. What to Look For. Locate the MODE button, the SET/INDIGLO button and the START/STOP button on the side of your Timex Indiglo WR 30M.
2. Setting the Hours. Press down the MODE button until "TIME" appears. ...
3. Setting Minutes and Date

https://oureverydaylife.com/how-do-i-change-the-time-on-a-timex-indiglo-wr-30m-12421830.html
How to set the time on timex WR30M watch Google Search

try this link below
http://assets.timex.com/manuals/?timexBrand=core

The Timex Ironman 30 Lap also has a stopwatch that can be used to keep track of split times for racing sports like running or cycling. Press the "Mode" button until the display shows "Chrono," then press and hold the "Set/Recall" button. To start the timer, press the "Start/Split" button. It will continue to run even if you exit to another mode. Pressing the "Stop/Reset" button will stop the chronograph. To record a split time, press the "Start/Split" button again while the timer is running. To see your split times, press the "Set/Recall" button while the watch is in Chrono mode. You can then scroll through the various splits with the plus and minus keys. Press "Set/Recall" again to exit display mode and return to the timer.

I just bought a Sportline 241 last week. The instructions are as follows. Note that there are no instructions for setting the 12/24 hour time option. Mine is in 24 hour mode (which is what I wanted), but I do not recall if it arrived that way or if I stumbled onto this mode when setting the time/date or alarm functions.

I hope this helps.


SPORTLINE 241 WALKING ADVANTAGE KEYCHAIN STOPWATCH

FEATURES:
24 hour stopwatch
Time-of-day and calendar
Alarm clock
12/24 hour time option

BATTERY:
Replace with LR41 battery

TO SET TIME AND CALENDAR:
From normal time display, press MODE button three times to enter Set Time/Date Mode. Seconds is automatically selected.
Press SPLIT/RESET button to cycle through minutes, hours, day, month, day of week, seconds.
Press START/STOP SET button to change digits on any of the above (seconds only: resets to 00).
Press and hold START/STOP SET button to advance digits rapidly.
Press MODE button once to return to normal time display.
From normal time display, press and hold START/STOP SET button to see the month, day, and day-of-week.

TO SET ALARM:
From normal time display, press MODE button twice to enter Set Alarm Mode. Hours is automatically selected.
Press SPLIT/RESET button to cycle through minutes and hours.
Press START/STOP SET button to change digits.
Press and hold START/STOP SET button to advance digits rapidly.
Press MODE button to return to normal time display.
From normal time display, press and hold SPLIT/RESET button to see the alarm time setting.

TO ARM/DISARM ALARM SOUND:
From normal time display, press and hold SPLIT/RESET button, then repeatedly press START/STOP SET button to arm/disarm alarm sound.
Alarm will sound when indicator shows in upper right corner.
Release SPLIT/RESET button to return to normal time display.

TO ARM/DISARM HOURLY CHIME SOUND:
From normal time display, press and hold SPLIT/RESET button, then repeatedly press MODE button to arm/disarm hourly chime sound.
Chime will sound when dashes appear along top of display.
Release SPLIT/RESET button to return to normal time display.


STOPWATCH OPERATION - GENERAL:
From normal time display, press MODE button once to reach stopwatch timer display.
After use of any stopwatch feature, press MODE button once to return to normal time display.

START-STOP (TIME-IN/TIME-OUT) TIMING:
With stopwatch timer on display, repeatedly press START/STOP SET button to start or stop the timer. When timer is stopped, press SPLIT/RESET button to reset timer to 0.

SPLIT TIMING:
With stopwatch timer on display, start the timer with START/STOP SET button. Repeatedly press SPLIT/RESET button to split or release the timer. Press START/STOP SET button to stop the timer. Press SPLIT/RESET button to reset timer to 0.

1-2 FAST FINISH:
With stopwatch timer on display, start the timer with START/STOP SET button.
Press SPLIT/RESET button for STOP #1.
Press START/STOP SET button for STOP #2. The stop time for #1 will now be shown.
Press SPLIT/RESET button. The stop time for #2 will now be shown.
Press SPLIT/RESET button to reset the timer to 0.

hello,push and hold the mode button for 3 seconds,then push the mode button one more time and now your at time change.
the st/stop button changes to the seconds,minutes and then hours,the lap/reset button changes the numbers.when your finished push the mode button and your done.

Are you just starting and stopping the chronograph (stopwatch)?

HI

HERE IS SOME STEPS FOR YOUR DOUGHTS......

Set the chronograph. Push the bottom left button until you see the word "CHRONO" on your watch. Press the top right button to pick "Lap" or "Split." Press the top right button to start or stop the timer.

Press the bottom left button to see your lap or split time. Press the bottom left button to pause the timer. Press the top right button to start again. When you're finished, press the bottom left button to stop timing. Push it again to reset it your chronograph to zero.

THANK YOU

These are settings for the Timex SPORTS 1440 Magnetism (5b841 -W163US)
These are for the 4 button SPORTS 1440 (not 6 button) - they will also work for the 1440 SPORTS "Informer" model wrist watch - you will NOT find these instructions on the Timex website - only the 6 button which will not work on these watches is on that site!

TIME AND DATE

1. Press and hold MODE until HOURS digits flash (you'll be in Alarm Mode) Press MODE again to enter TIME mode, SECONDS digits will flash.
2. Press ADJUST to set SECONDS to zero.
3. Press START/STOP to select MINUTES.
4. Press ADJUST to change.
5. Repeat to set HOURS, MONTH, DAYS, and DAY of WEEK. Go through 12 hours to set AM or PM.
6. Press MODE when done.
7. To display DATE from Time display , press START/STOP.
8. With DATE displayed press and hold START/STOP, then press ADJUST to change display between DATE-MONTH and MONTH-DATE.
9. With TIME displayed, press and hold ADJUST, then press MODE to switch between 12-and 24-hour format.

ALARM AND HOURLY CHIME

1. Press and hold MODE until HOURS digits, DAY, and A or P (for AM or PM) flash.
2. Press ADJUST to change HOURS digits. Go through 12 hours for AM or PM.
3. Press START/STOP to select MINUTES.
4. Press ADJUST to change.. Press MODE when done.
5. Press and hold ADJUST, then press START/STOP to turn chime on/off. Press START/STOP again to turn alarm on /off. Release START/STOP when done.

CHRONOGRAPH

1. Chronograph will count up to 24 hours. Lap times are not stored. After 40 minutes chrono display changes from seconds to minutes.
2. With time displayed, press MODE to select Chrono Mode.
3. Press START/STOP to start.
4. Press ADJUST to view lap time. Press again to sesume lap timing.
5. Press START/STOP to stop timing . Press ADJUST to reset chrono to zero.
6. Repeat for successive laps.

Have fun! - Not a bad watch for the money! - - Silver Bullet