Your Bangalore keeps track of the time and day of the week with its in-built clock.
If you ever disconnect the battery (or it goes flat), the time will reset to 0800 (8 am) when you next reconnect the battery.
You'll need to reset the clock to the correct time, otherwise your Bangalore might be out of sync with the rest of the world and start firing at night (or early in the morning).
To check the time, put the Bangalore into OFF mode by holding the "ADVANCED PROGRAM" button.
After a few seconds, the screen will show "OFF" followed by the time in 24-hour format.
Check that the time's correct. If it's not, see "How do I set the time and day?"