We can tell the time without saying AM and PM though - for this, we use the 24 hour clock. The 24 hour clock always uses 4 digits, and we use this system most often with digital clocks.

Daylight saving time started on March 9, 2025. Here's a look at a 24-hour chart comparing daylight saving time (DST) and standard time (ST) and tips that can help you adjust.

We can tell the time without saying AM and PM though - for this, we use the 24 hour clock. The 24 hour clock always uses 4 digits, and we use this system most often with digital clocks.