Clocks have an hour hand and a minute hand (and sometimes a second hand).
The hour hand is pointing to between 6 and 7, so we know it is after 6 o'clock but before 7 o'clock.
The minute hand is pointing to 6 which is really 5 x 6 = 30 minutes.
So the time shown is half past 6
which is 0630 in 24-hour clock time if it is the morning and 1830 if it is the evening.
24-hour clock time uses 4 digits and no symbols.
NB. The evening time is 12 hours later than the morning time (6 + 12 = 18)
When we move on 1 minute, the hands look like this.
The hour hand has moved a tiny tiny tiny amount.
The minute hand has moved forward one minute.
So the time shown is 0631 or 1831
Want to understand this further and learn how this links to other topics in maths?
Why not watch this video?