Before inserting the battery, locate the Time Zone switch (usually P, M, C, E for North American zones) and the DST switch (On/Off).
Once you reach the correct time, stop pressing the button. If no buttons are pressed for 7 seconds , the clock will exit manual mode and resume normal ticking. Forcing a Signal Search (Forced Reception)
If you live in an area with poor signal reception, or if you want to use the clock immediately without waiting for the radio signal, you can set the time manually.