Reading the Time/Date Stamp




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Reading the Time/Date Stamp
This handout contains several reference charts as well as a few Time/Date conversion examples and exercises. If you have any questions or need assistance, you should contact or e-mail your workshop leader.

Conversion Tables
Converting Time from a 24-Hour Clock to a 12-Hour Clock


24-Hour Clock

12-Hour Clock




24-Hour Clock

12-Hour Clock

00:00

12:00 midnight




12:00

12:00 pm noon

01:00

1:00 am




13:00

1:00 pm

02:00

2:00 am




14:00

2:00 pm

03:00

3:00 am




15:00

3:00 pm

04:00

4:00 am




16:00

4:00 pm

05:00

5:00 am




17:00

5:00 pm

06:00

6:00 am




18:00

6:00 pm

07:00

7:00 am




19:00

7:00 pm

08:00

8:00 am




20:00

8:00 pm

09:00

9:00 am




21:00

9:00 pm

10:00

10:00 am




22:00

10:00 pm

11:00

11:00 am




23:00

11:00 pm










24:00

12:00 pm



Converting Coordinated Universal Time (UTC) to your Local Time Zone


Standard Time

Daylight Savings Time

UTC – 5 hours = EST

UTC – 6 hours = CST

UTC – 7 hours = MST

UTC – 8 hours = PST



UTC – 4 hours = EDT

UTC – 5 hours = CDT

UTC – 6 hours = MDT

UTC – 7 hours = PDT




Related Issues


  • Time Zones Acronyms: It is important to remember to add or subtract an hour if it is Daylight Saving Time (Hawaii and parts of Arizona and Indiana do not use daylight saving time). Here are the acronyms referred to above.




Standard Time

Daylight Saving Time

EST - Eastern Standard Time

CST - Central Standard Time

MST - Mountain Standard Time

PST - Pacific Standard Time



EDT - Eastern Daylight Time

CDT - Central Daylight Time

MDT - Mountain Daylight Time

PDT - Pacific Daylight Time






  • Time Zone Names: Coordinated Universal Time (UTC) is often expressed in three different ways: Greenwich Mean Time (GMT), Zulu (Z, this is also the American military time standard), and Universal Time (UT). In reality, all of these refer to slightly different time zones that differ only by a few seconds. For our purposes, they all refer to the same time zone.


Time/Date Stamp Conversion Examples
The following are two examples that illustrate how to read a Time/Date Stamp and how to determine the age of the data.
Example 1: Time/Date Stamp: 12 DEC 00 07:00 UTC

Current Time: December 12, 2000 8:00 am

Location: Miami, FL
12 DEC 00 = December 12, 2000
UTC – 5 hours = EST
07:00 UTC – 5 hours = 02:00 EST

02:00 UTC = 2:00 am EST, therefore . . .
Time and Date the data was recorded: 2:00 am December 12, 2000
Current Time – Recorded Time = Age of Data
8:00 am December 12, 2000 – 2:00 am December 12, 2000 =

0 days, 6 hours, 0 minutes
Age of Data: 0 days, 6 hours, 0 minutes .

Example 2: Time/Date Stamp: 14 JAN 01 18:45 GMT

Current Time: January 15, 2001 4:30 pm

Location: Hoboken, NJ
14 JAN 01 = January 14, 2001
GMT – 5 hours = EST
18:45 GMT – 5 hours = 13:45 EST

13:45 GMT = 1:45 pm EST, therefore . . .
Time and Date the data was recorded: 1:45 pm January 14, 2001 .
Current Time – Recorded Time = Age of Data
4:30 pm January 15, 2001 – 1:45 pm January 14, 2001 =

0 days, 26 hours, 45 minutes
Age of Data: 1 day, 2 hours, 45 minutes .

Converting Time/Date Stamps Practice
Determine when that data was taken and the “age” of the data.
Time/Date Stamp: 05 JAN 01 15:20 UTC

Current Time: January 5, 2001 3:00 pm

Location: Miami, FL

Time and Date the data was recorded: ______________________________

Age of Data: ______________________________

2. Time/Date Stamp: 31 DEC 00 05:20 GMT

Current Time: January 1, 2001 9:00 am

Location: Phoenix, AZ (Phoenix does NOT use Daylight Saving

Time)

Time and Date the data was recorded: ______________________________


Age of Data: ______________________________

3. Time/Data Stamp: 22 JUL 00 22:30 Z

Current Time: July 25, 2000 11:30 pm

Location: Cleveland, OH


Time and Date the data was recorded: ______________________________


Age of Data: ______________________________


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