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/.
7am PDT is 2pm GMT. PDT is 7 hours behind 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.
10 AM PDT is 5 PM GMT. Pacific Daylight Time (PDT) is 7 hours behind Greenwich Mean Time (GMT). Therefore, when it is 10 AM in PDT, you add 7 hours to convert it to GMT.
0645 GMT = 2245 PST = 2345 PDT x
13 hours
Afghanistan Time (AFT) is 11½ hours ahead of Pacific Daylight Saving Time (PDT).
10am EDT is 2pm GMT. The time difference between EDT and GMT is 4 hours, with GMT being ahead.
The difference is 6 hours (from -4 GMT to +2 GMT).
9 am PDT is 12 pm EST. There is a 3-hour time difference between Pacific Daylight Time (PDT) and Eastern Standard Time (EST).
4 HOURS
Central Standard time is GMT -6 Central Daylight Time GMT -5