Time zone HST could mean:
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Similar to HST
EST - Eastern Standard Time [UTC - 0500]EST - European Standard Time
ET - Eastern Time [UTC - 0500]
ET - Ephemeris Time obsolete
GA - Greenwich Atomic name used in UK for UTC prior to 1964
GBT - Great British Time
GCT - Greenwich Civil Time suggested replacement name, in 1925, for GMT
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