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