It means that, of all the times you look at the clock, you remember the times that have the same numbers as your birthday.

The reason you remember those times is because the numbers of your birthday have special significance for you. See the why you start seeing certain number again and again for an explanation.

Some people don't notice when their birthday numbers on the clock, or don't correlate the numbers with their birthday. Others do notice but don't associate any significance to the event and rarely remember they saw them. And some people, like yourself, remember seeing the numbers.

See why people see certain numbers all the time to find out what happens when a person starts to wonder if there's a special personal meaning for why they see certain numbers so often.