GMT is the time all other time zones are kept by, it id the time in the UK and the time shown on Big Ben the clock tower in London. PDT is an American timezone, which i believe is GMT-7 ie it is 7 hours behind GMT.
The time zone PDT has -7 hours difference form GMT and IST has + 5.30. Have a look in to this site, http://www.timeanddate.com/.
It is 1 hour earlier in PDT then it is in MST.
0645 GMT = 2245 PST = 2345 PDT x
UAE time = GMT +4
08:30 PST is 17:30 GMT
Pacific Standard from GMT is -8 hours. So 04.00am Pacific when 12.00 noon Greenwich London. Pacific Daylight saving time is thus 7 Hours behind Greenwich Mean Time - but still 8 hours behind British Summer Time.
Gmt -7
13 hours
Afghanistan Time (AFT) is 11½ hours ahead of Pacific Daylight Saving Time (PDT).
The difference is 6 hours (from -4 GMT to +2 GMT).
England is GMT, Vancouver is GMT-8 hours
4 HOURS