La Crosse Technology WS-9121 - Manual (Page 23)

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1. In normal display mode, press and hold the “SET/ CH” key for
about 3 seconds. The "12h" or "24h" digit will be flashing.
2. Press the “MIN/MAX/+” key to set the desired time display mode.
3. Press shortly the “SET/ CH” key to advance to the MANUAL
TIME SETTING.
MANUAL TIME SETTING
User shall manually set the time of the Temperature Station by the
following steps:
1.
The hour digit of the time display will be flashing.