Marathon watch wr50m instructions John Howard/Digital Vision/Getty Images You can set your digital Timex watch to display military, or 24-hour, time. In other words, 1:00pm would display as 13:00 and 12:30am would display as 00:30. Instructions may vary somewhat between models, with different buttons in different positions, but the general WR-30, WR-50 and WR-100 indicate a standard of water resistance found on all Timex watches. If you are searching for a specific style, please try another feature or function. wr50 wr30 wr100 wr-30 wr-50 wr-100 Timex Short walk through tutorial on a Timex 1440 Sports Watch also works for most other 4 button Timex watches. i.e. WM50, WR50M and Marathon.