Zulu Time

Since the world is broken up into 24 times zones, the time-stamped data that each providers database stores requires a common point of reference.   In this way, times stored in Wash DC will indicate the same time as that in LA.  For example, if the provider experienced an unusual peak in voice traffic across the US at 1 PM Eastern Standard time, it would be recorded as occurring at 1 PM in Wash DC, and at 10 am in Los Angeles.  If a report is issued on this event, what time should be assigned to it?   

Each provider uses "Zulu" time to reference times with statistics, such as voice reports, so that they all list the same time.  If the actual time of a particular time zone is required - then the Zulu time is converted.

Zulu Time  (Z time)  is the standard time used by meteorologists, and is the same time, at any given instant - world wide. Thus, when it it 6Z here, it is 6Z everywhere.  Zulu time is the same as Greenwich time. In the Eastern US time zone, we are 4 hours behind during daylight savings time, and 5 hours during standard time. To convert EDT to zulu, first convert it to 24 hr time, then add 4. To convert EST, first convert to 24 hr time, then add 5. Thus our 13Z, 17Z, and 21Z observation times are really 9A, 1P, and 5P EDT; or 8A, 12P, and 4P EST.ZULU

Or even easier - use the Table below  .  .  .

 

 

Zulu

EST

EDT

0

7 pm

8 pm

1

8 pm

9 pm

2

9 pm

10 pm

3

10 pm

11 pm

4

11 pm

12 am

5

12 am

1 am

6

1 am

2 am

7

2 am

3 am

8

3 am

4 am

9

4 am

5 am

10

5 am

6 am

11

6 am

7 am

12

7 am

8 am

13

8 am

9 am

14

9 am

10 am

15

10 am

11 am

16

11 am

12 pm

17

12 pm

1 pm

18

1 pm

2 pm

19

2 pm

3 pm

20

3 pm

4 pm

21

4 pm

5 pm

22

5 pm

6 pm

23

6 pm

7 pm