Read and Write Time
- Time is defined as an ongoing event that will occur from the past through the present into the future.
- Having the proper knowledge of time is very essential.
- We measure time using clock.
It is observed that in a clock there are 12 division and each number represents an hour.
There are 24 hours in a day. Therefore, the hands in the clock take two complete rounds in a day.
The two ways of representing time are:
- 12-hour clock
- 24-hour clock
In 12-hour clock, the day is divided into two 12-hours period:
- From Midnight to noon, we use AM to denote time. (The AM hours)
- From Noon to midnight, we use PM to denote time. (The PM hours)
Thus, in 12-hour clock the time is written using AM and PM.
- The time “11:00 PM” means 11 ‘o’ clock in the night or 1 hour before midnight.
- The time “10:00 AM” means 10 ‘o’ clock in the morning or 2 hours before noon.
In 24-hour clock, the day is divided as 24-hours period.
- The days runs from midnight to midnight.
- The time of a whole day in the 24-hour clock is written as 00.00 to 23: 59(midnight is 00:00).
- From midnight to noon the time will be written in 24-hour clock as 00.00 to 12.00.
- From noon to midnight the time will be written in the 24-hour clock as 12:00 to 23:59.
- In airport, railway station, digital clocks, 24-hour clock is used to show time.
Let us discuss it with an example.
- Rima observed that the time to reach Burdwan local in Bally station is 13: 15. What will be the time of Burdwan local in 12hour clock?
We know that the time in railway station is given in 24-hour clock.
So, 13: 15 means it is 1: 15 am in the noon.
Hence, the time of the train in 12-hour clock is 1: 15 am.
Representation of Time in 12-hour and 24-hour clock:
Comparison of 12-hour clock and 24-hour clock: