Converting TT to UTC
To convert the TT time used in the tables to EST:
subtract 64 seconds (approx.) to convert TT to UTC,
then subtract 5 hours to convert UTC to EST.
If daylight saving time is in effect (in summer), subtract 4 hours to convert UTC to EDT.
Reference: Systems of time.
UTC GPS TAI TT (TDT)
----+---------+-------------+-------------------------+-----
| | | ET 1984.0
|<--32s Leap Seconds--->|<----32.184S fixed------>|
| | | |
|<--13s-->|<----19s---->| |
| fixed |
| |
-----+---------------TDT-UT Prediction----------------+-----
UT1 (UT) TT (TDT)
Reference: iastate.edu
The time Zones and conversions for North America and the Pacific are:
Zone | Standard Time | Daylight Savings Time
-------- | --------------------------- | ----------------------------
| Abbreviation Conversion | Abbreviation Conversion
Atlantic | UTC - 4 hrs | UTC - 3 hrs
Eastern | EST UTC - 5 hrs | EDT UTC - 4 hrs
Central | CST UTC - 6 hrs | CDT UTC - 5 hrs
Mountain | MST UTC - 7 hrs | MDT UTC - 6 hrs
Pacific | PST UTC - 8 hrs | PDT UTC - 7 hrs
Alaska | UTC - 9 hrs | UTC - 8 hrs
Hawaii | UTC - 10 hrs | UTC - 9 hrsTime Zones