If the date and time on your Longines mechanical watch are inaccurate, how do you adjust the time? Pressing S2 allows for an adjustment within a 30-second error margin. To prevent accidental activation, S2 usually requires a pointed or hard object (such as a pin or pen tip) to press it. Adjustment method: When the LCD display shows the time, press S1 twice in succession to make the LCD display seconds. At this point, you can press S2 to make adjustments. When the second display on the LCD is between 01-29 seconds, you can adjust for being too fast; pressing S2 will cause the time to quickly retreat to zero. When the LCD displays between 30-59 seconds, you can adjust for being too slow; pressing S2 will cause the time to quickly advance to zero. For example: If the standard time for the Longines watch is about to be 11:00, but the electronic watch is already 10 seconds fast, meaning it will show 11:00:10 at 11:00:00, you just need to press S1 before the timing signal to put it into the second display state. Then, when the timing signal arrives, press S2, and the electronic watch's display will quickly adjust to 11:00:00. Similarly, if the electronic watch is 10 seconds slower than the standard time, pressing S2 at the timing signal will make the electronic watch's display quickly jump from 10:59:50 to 11:00:00, achieving the purpose of adjusting the time. Using this method, you can quickly and conveniently calibrate the time discrepancy of the Longines watch within 30 seconds. If the time difference is large, you can also repeatedly use S2 to first reduce the error, then apply the above steps to calibrate.