Guess 10179G Booklet page 39

(iii) PRESS S1 to get into Countdown Day Timer [T3]
1) HOLD S2 3 seconds to set "Year"; Press S1/S3 to advance /
backward
2) PRESS S2 once to set "Month" Press S1 or S3 to advance /
backward
3) PRESS S2 once to set "Day" Press S1 or S3 to advance /
backward
4) PRESS S2 once when setting is complete.
E) CHRONOGRAPH
PRESS S3 three times to Chronograph Mode
1) PRESS S1 to select LAP (LAP) or Split (SPL) option
2) PRESS S2 to start/stop
3) PRESS S1 to get Lap/Split time
5) HOLD S2, then press S1 to "Reset"
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