We all know that the models of time and their relationships. Now, we’ll be taught to learn a railway schedule and a calendar.

Allow us to revise:

60 seconds = 1 minute

60 minutes = 1 hour

24 hours = 1 day

7 days = 1 week

52 weeks + 1 day = 1 12 months = three hundred and sixty five days

52 weeks + 2 days = 1 intercalary year = three hundred and sixty six days

10 years = 1 decade

100 years = 1 century

A 12 months is split into 12 months.

Observe: In a intercalary year February has 29 days.

The 24-hour Clock Time:

In our day by day life we use a 12-hour clock. However some departments like Railways, Airways and Armed forces use 24-hour clock. Digital watches additionally present time in 24-hour clock time.

Have a look at these clock.

We will see each the clocks are displaying the identical time However the best hand digital clock 22:30 tells us that it’s 10:30 within the evening as a result of it expresses 24-hour clock time. 24-hour clock typically used at airports and railway stations to point out flight or practice timings. It clarifies the confusion of whether or not it’s day or evening.

In a 24-hour clock, every new day begins at mid-night. In an analogue clock (12-hour clock), the identical time is proven twice a day and we use a.m. or p.m. to inform what a part of the day it’s.

12-hour clock time                                24
hour clock time

12-midnight                                           2400
hours or 0000 hours

1 a.m.                                                   0100
hours

1:30 a.m.                                              0130 hours

4:50 a.m.                                              0450
hours

11.10 a.m.                                            1110
hours

12 midday                                                1200
hours

12:30 p.m.                                            1230
hours

1:00 p.m.                                              1300
hours

11:30 p.m.                                            2330
hours

Within the 24-hour clock, the time from midnight to midnight is 1 day (24 hours)

Zero hours or 24 hours = midnight

12 hours = noon = midday                     12 hours = 1200 hours

2 p.m. = 1400 hours and so forth               1 p.m. = 1300 hours

Guidelines for Changing 24 Hour to 12-Hour or Customary Time

1. The numeral shaped by the 2 digits from the best denotes the variety of minutes.

2. If the numeral shaped by the primary two digits from the left is lower than 12, it denotes the variety of hours earlier than midday and so a.m. is for use with it.

i.e., Use a.m. if the variety of hours is lower than 12.

For instance: 

(i) 0845 hours                   08:45 a.m.

(ii) 0500 hours                  05:00 a.m., or, 5 a.m.

(iii) 1145 hours                 11 hrs. 45 min. a.m. or, 11:45 a.m.

(iv) 1020 hours                 10:20 a.m.

3. If the numeral shaped by the primary two digits from the left is bigger than 12, the distinction between the quantity and 12 offers the variety of hours after midday and so p.m. is for use with it.

i.e., Use p.m. if the variety of hours is greater than 12.

For instance: 

(i) 1345 hours                   01:45 p.m. (13 – 12 = 1)

(ii) 2050 hours                  08:50 p.m. (20 – 12 = 8)

(iii) 1300 hours                   1:00 p.m. (13 – 12 = 1)

(iv) 1845 hours                   6.45 p.m. (18 – 12 = 6)

● If the variety of hours is 12 and minutes is greater than 00, then it’s previous midday.

For instance:

(i) 1220 hours                  12:20 p.m. 

(ii) 1234 hours                 12:34 p.m.

We usually use 12-hour clock system. The hour hand of the clock goes around the dial twice a day (24 hours). Some departments like railways, Airways, and so forth use 24-hour clock system as a result of they don’t use a.m. and p.m. occasions.

In a 24-hour clock system, we categorical time in 4 digits. The primary two digits signify hours and the final two digits signify the minutes.

On the dial there are two
concentric circles. The inside circle has 1 to 12 numbers whereas the outer
circle has 13 to 24 numbers.

In a 24-hour clock system, we begin counting the time from midnight. Allow us to perceive 24-hour system by contemplating some examples.  

(i) 12 midnight is denoted by 24 00 hours or 00 00 hour.

(ii) 12 midday is denoted by 12 00 hours.

(iii) 6 within the morning is denoted by 06 00 hours.

(iv) 10:25 within the night is denoted by 22 25 hours. 
(10:25 + 12:00)

(v) 7:15 within the night is denoted by 19 15 hours. 
(7:15 + 12:00)

From the above examples, we are able to conclude that between 12 midnight and 12 midday the 24-hour clock time is similar.

For instance, 10 40 hours = 10:40 a.m., 08 20 hours = 8:20 a.m., 11 30 hours = 11:30 a.m.

However between 12 midday and 12 midnight to transform the 24-hour clock time into 12-hour clock time, we subtract 12 from the 24-hour time.

For instance, 19:30 hours = 19:30 – 12:00 = 7:30 p.m.

Equally, to transform the 12-hour clock time into 24-hour clock time between 12 midday and 12 midnight, we add 12.

For instance, 11:30 p.m. = 11:30 + 12:00 = 23:30 hours.

Due to this fact, the time which is proven by the inside circle is the time earlier than midday and that proven by the outer circle is the time after midday.

These are some extra examples:

After midnight          00:10 a.m. is proven as 00:10

                              02:45 a.m. is proven as 02:45

                              10:48 a.m. is proven as 10:48

                              02:45 p.m. is proven as 14:45

                              10:48 p.m. is proven as 22:48

               Clock                Normal Time                  24 hour clock

We all know how you can use a.m. and p.m. to signify the time of the day in 12-hour clock. We all know {that a}.m. is used to specific time between 12 o’clock mid evening to 12 o’clock midday and p.m. is used to specific time between 12 o’clock midday to 12 o’clock midnight.

In 24-hour clock time, we categorical time in 4 digits. The primary two digits from left represt hours and the final two digits signify the minutes.

So, to specific time for a.m., we simply write the time with out separating hours and minutes.

For instance 7:45 am is written as 0745 hours.

To precise time for p.m. we add 12 to the hours after which write hours and minutes with out separating them. For instance 6:30 p.m. is written as (6 + 12), 1830 hours.

24-Hour Clock Time Format:

The hour hand of the clock goes around the clock twice a day meaning 24 hours. 24-hour clock time doesn’t have a.m. or p.m. In 24-hour clock system, we categorical time in 4 digits. The primary two digits signify hours and the final two digits signify the minutes. There are not any dots to separate hours and minutes. The time begins at 0000 hours or 2400 hours which is 12 midnight.

24-Hour Clock Time Chart

Click on right here to obtain the 24-Hour Clock Time Chart.

In a 24-hour clock system, we begin counting the time from midnight. Allow us to perceive 24-hour system by contemplating some examples.

1. Changing 12-Hour Clock to 24-Hour Clock Time Format:

12-Hour Time to 24-Hour Time Conversion Desk

I. For the primary hour of the day (12 Midnight to 12:59 a.m.), subtract 12 hours

For instance:

(i) 12 Midnight = 0000 hours

(ii) 12:05 a.m. = 0005 hours

(iii) 12:40 a.m. = 0040 hours

 

II. From 1:00 a.m. to 12:59 p.m., no change.

For instance:

(i) 6:40 a.m. = 0640 hours

(ii) 12:30 p.m. = 1230 hours

(iii) 10:45 a.m. = 1045 hours

 

III. From 1:00 p.m. to 11:59 p.m., add 12 hours

(i) 3:45 p.m. = 1545 hours (3:45 + 12)

(ii) 6:20 p.m. = 1820 hours (6:20 + 12)

(iii) 08:55 p.m. = 2055 hours (8:55 + 12)

 

2. Changing 24-Hour Clock to a.m. or p.m.

I. For the primary hour of the day (0000
to 0059), add 12 hours to make it a.m.

For instance:

(i) 0001 hours = 12:01 a.m.

(ii) 0048 hours = 12:48 a.m.

 

II. From 0100 hours to 1159 hours,
simply add a.m. after the hours.

For instance:

(i) 0225 hours = 2:25 a.m.

(ii) 1150 hours = 11:50 a.m.

 

III. From 1200 hours to 12 hours 59, simply add p.m. after the
hours.

For instance:

(i) 1235 hours = 12:35 p.m.

(ii) 1205 hours = 12:05 p.m.

 

IV. From 1300 hours to 23 hours 59, subtract 12 hours to make it
p.m.

For instance:

(i) 1355 hours = 1:55 p.m.

(ii) 1725 hours = 5:25 p.m.

Questions and Solutions on 24 Hour Clock Time Format:

I. Convert the time given in a.m. and p.m. type into the
24-hour type. One is proven for instance.

(i) 1 : 24 p.m.

1 : 24 p.m. = 1 : 24 + 12 : 00

                    =
13 : 24

1 : 24 p.m. = 1324 hours

(ii) 7 : 16 a.m.

(iii) 4 : 55 a.m.

(iv) 6 : 54 p.m.

(v) 9 : 33 p.m.

(vi) 11 : 42 p.m.

Solutions:

I. (ii) 0716 hours

(iii) 0455 hours

(iv) 1854 hours

(v) 2133 hours

(vi) 2342 hours

II. Convert the time given in 24- hour type right into a.m./p.m.
type. One is proven for instance.

(i) 1341 hours

1341 = 1341 – 1200

        = 1 : 41 p.m.

1341 = 1 : 41 p.m.

(ii) 2325 hours

(iii) 1750 hours

(iv) 0853 hours

(v) 0432 hours

(vi) 1539 hours

Solutions:

II. (ii) 11 : 25 p.m.

(iii) 05 : 50 p.m.

(iv) 08 : 53 a.m.

(v) 04 : 32 a.m.

(vi) 03 : 39 p.m.

III. Convert the next 12-hour clock time to 24-hour clock time.

(i) 7:15 p.m.

(ii) 6:45 a.m.

(iii) 12:15 p.m.

(iv) 2:50 a.m.

(v) 10:10 p.m.

(vi) 6:30 p.m.

Reply:

III. (i) 1915 hours

(ii) 0645 hours

(iii) 1215 hours

(iv) 0250 hours

(v) 2210 hours

(vi) 1830 hours

IV. Change to 24 hour clock time:

(i) 4:15 a.m.

(ii) 6:30 p.m.

(iii) 12:45 p.m.

(iv) 1:20 a.m.

(v) 9:30 a.m.

(vi) 10:25 p.m.

Reply:

IV. (i) 0415 hours

(ii) 1830 hours

(iii) 1245 hours

(iv) 0120 hours

(v) 0930 hours

(vi) 2225 hours

V. Convert the next 24-hour clock time to 12-hour clock time.

(i) 1345 hours

(ii) 0330 hours

(iii) 2035 hours

(iv) 0515 hours

(v) 1655 hours

(vi) 1945 hours

Reply:

V. (i) 1:45 p.m.

(ii) 3:30 a.m.

(iii) 8:35 p.m.

(iv) 5:15 a.m.

(v) 4:55 p.m.

(vi) 7:45 p.m.

VI. Change to 12 hour clock time:

(i) 1700 hours

(ii) 1535 hours

(iii) 0030 hours

(iv) 2000 hours

(v) 2215 hours

(vi) 2300 hours

Reply:

VI. (i) 5:00 p.m.

(ii) 3:35 p.m.

(iii) 12:30 a.m.

(iv) 8:00 p.m.

(v) 10:15 p.m.

(vi) 11 p.m.

VII. Write the proper 24-hour clock time with every analog clock.

Solutions:

VII. (i) 1535 hours

(ii) 0505 hours

(iii) 2015 hours

(iv) 0400 hours

(v) 0150 hours

(vi) 2020 hours

(vii) 2230 hours

(viii) 1955 hours

VIII. The practice, Charminar Categorical runs between Hyderabad and Chennai. The arrival and departure time of it at totally different stations are given beneath.

a → Arrival Time

d → Departure Time

Observe the desk and reply the next questions in 12-hour clock time.

(i) When does the practice arrive at Warangal station?

(ii) At what time does the practice depart Vijayawada station?

(iii) When does the practice begin from Hyderabad station?

(iv) At what time does the practice attain Chennai?

Reply:

VIII. (i) 9:59 p.m.

(ii) 1:55 a.m.

(iii) 7:00 p.m.

(iv) 9:20 a.m.

Associated Ideas

● Items
for Measuring Size

● Measuring
Devices

● To
Measure the Size of a Line-segment

● Perimeter
of a Determine

● Unit of
Mass or Weight

● Examples
on Unit of Mass or Weight

● Items
for The Measurement of Capability

● Examples
on Measurement of Capability

● Measurement
of Time

● Learn a
Watch or a Clock

● Antemeridian
(a.m.) or Postmeridian (p.m.)

● What Time it’s?

● Time
in Hours and Minutes

● 24 Hour Clock

● Items of Time

● Examples
Items of Time

● Time Period

● Calendar

● Studying
and Deciphering a Calendar

● Calendar
Guides us to Know

4th Grade Math Actions

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