Ut stands for Atlantic Standard Time.
There are several different time zones that use the letters AST.
It can mean:
Alaskan Standard Time (GMT -7:00)
Atlantic Standard Time (GMT -4:00) on Canada's east coast.
Arabic Standard Time (GMT +3:00) in Iraq
Arab Standard Time (GMT +3:00) in Kuwait and Saudi Arabia
Arabian Standard Time (GMT +4:00) in the United Arab Emirates
Afghanistan Standard Time (GMT +4:30)
There are currently two time zones that share the abbreviation AST:
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AST is one of many ambiguous time zone designations. It stands for both Atlantic Standard Time (UTC-4) and Arabia Standard Time (UTC+3).
The people who control the time zone database not only tolerate ambiguous time zone designations, but the often create them themselves! In fact, they're doing it again in December 2014, making BST (British Summer Time) ambiguous on the 27th, when Bougainville Standard Time begins its existence. I absolutely refuse to play along with such an extremely idiotic practice, so I use my own abbreviations for most of the ambiguous ones, including AAST for Arabia Standard Time and BOUST for Bougainville Standard Time.
The time difference between Atlantic Standard Time (AST) and Greenwich Mean Time (GMT) is typically 4 hours. When it is 12:00 PM GMT, it would be 8:00 AM AST.
There are two time zones abbreviated AST.
GMT is four hours ahead of Atlantic Standard Time.
Arabia Standard Time is three hours ahead of GMT.
10am EDT is 2pm GMT. The time difference between EDT and GMT is 4 hours, with GMT being ahead.
The time difference between Australian Eastern Standard Time (AEST) and Greenwich Mean Time (GMT) is 10 hours. AEST is 10 hours ahead of GMT.
The time difference between New York standard time (EST) and Greenwich Mean Time (GMT) is 5 hours. EST is 5 hours behind GMT.
The time difference between England and Vancouver, Canada, is 8 hours. England is 8 hours ahead of Vancouver.
The difference between mountain time zone whether it is MST or MDT and GMT is 7 hours time difference. If it is midnight MST or MDT, it is 7:00 am the same day GMT.