Many official government reports regarding natural disasters (like tsunamis) are timestamped with UTC (coodinated universal time). It’s also the default timestamp for WordPress. UTC, a 24-hour time notation, used to be known as Greenwich Mean Time (GMT).  

For people in the United States (anyone west of the zero meridian and east of the international date line), we subtract hours from the UTC. For example, 2100 UTC is 1300 or 1.00 pm PST.

The following chart is a crib sheet for the continental U.S.

UTC/GMT EDT
(-4)
EST/CDT
(-5)
CST/MDT
(-6)
MST/PDT
(-7)
PST
(-8)
0000 8 PM 7 PM 6 PM 5 PM 4 PM
0100 9 PM 8 PM 7 PM 6 PM 5 PM
0200 10 PM 9 PM 8 PM 7 PM 6 PM
0300 11 PM 10 PM 9 PM 8 PM 7 PM
0400 Midnight 11 PM 10 PM 9 PM 8 PM
0500 1 AM Midnight 11 PM 10 PM 9 PM
0600 2 AM 1 AM Midnight 11 PM 10 PM
0700 3 AM 2 AM 1 AM Midnight 11 PM
0800 4 AM 3 AM 2 AM 1 AM Midnight
0900 5 AM 4 AM 3 AM 2 AM 1 AM
1000 6 AM 5 AM 4 AM 3 AM 2 AM
1100 7 AM 6 AM 5 AM 4 AM 3 AM
1200 8 AM 7 AM 6 AM 5 AM 4 AM
1300 9 AM 8 AM 7 AM 6 AM 5 AM
1400 10 AM 9 AM 8 AM 7 AM 6 AM
1500 11 AM 10 AM 9 AM 8 AM 7 AM
1600 Noon 11 AM 10 AM 9 AM 8 AM
1700 1 PM Noon 11 AM 10 AM 9 AM
1800 2 PM 1 PM Noon 11 AM 10 AM
1900 3 PM 2 PM 1 PM Noon 11 AM
2000 4 PM 3 PM 2 PM 1 PM Noon
2100 5 PM 4 PM 3 PM 2 PM 1 PM
2200 6 PM 5 PM 4 PM 3 PM 2 PM
2300 7 PM 6 PM 5 PM 4 PM 3 PM

Source.

Written by Kathy E. Gill

Digital evangelist, speaker, writer, educator. Transplanted Southerner; teach newbies to ride motorcycles! @kegill

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