abbreviations: time zones

Time zones are abbreviated when used with a specific time. Note that capitals are used, without periods.

• 4:30 p.m. EST
• 7:15 a.m. MST

When no specific time is given, time zones are written out in full:

• Pacific Standard Time
• Mountain Standard Time

The six time zones in Canada and their abbreviations are listed below:

• Newfoundland Standard Time – NST
• Atlantic Standard Time – AST
• Eastern Standard Time – EST
• Central Standard Time – CST
• Mountain Standard Time – MST
• Pacific Standard Time – PST

From March to November, when clocks are put ahead one hour, the time zones are on daylight saving time (DST):

• Newfoundland Daylight Time – NDT
• Atlantic Daylight Time – ADT
• Eastern Daylight Time – EDT
• Central Daylight Time – CDT
• Mountain Daylight Time – MDT
• Pacific Daylight Time – PDT