IST
India Standard Time
GMT +5:30
SMT
GMT -4

Time Difference

India Standard Time is 10 hours and 12.750000000000021 minutes ahead of
3:00 pm15:00 in IST is 4:47 am04:47 in SMT

IST to SMT call time
Best time for a conference call or a meeting is between 5:42.749999999999915pm-7:42.749999999999915pm in IST which corresponds to 7:30am-9:30am in SMT

3:00 pm15:00 India Standard Time (IST). Offset UTC +5:30 hours
4:47 am04:47 (SMT). Offset UTC -4:42 hours

3:00 pm15:00 IST / 4:47 am04:47 SMT

IST SMT
12am (midnight) 1:47 pm
1am 2:47 pm
2am 3:47 pm
3am 4:47 pm
4am 5:47 pm
5am 6:47 pm
6am 7:47 pm
7am 8:47 pm
8am 9:47 pm
9am 10:47 pm
10am 11:47 pm
11am 12:47 am
12pm (noon) 1:47 am
1pm 2:47 am
2pm 3:47 am
3pm 4:47 am
4pm 5:47 am
5pm 6:47 am
6pm 7:47 am
7pm 8:47 am
8pm 9:47 am
9pm 10:47 am
10pm 11:47 am
11pm 12:47 pm
0:00 13:47
1:00 14:47
2:00 15:47
3:00 16:47
4:00 17:47
5:00 18:47
6:00 19:47
7:00 20:47
8:00 21:47
9:00 22:47
10:00 23:47
11:00 0:47
12:00 1:47
13:00 2:47
14:00 3:47
15:00 4:47
16:00 5:47
17:00 6:47
18:00 7:47
19:00 8:47
20:00 9:47
21:00 10:47
22:00 11:47
23:00 12:47

India Standard Time

Offset: IST is 5 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia

Countries: It is used in following countries: India

Principal Cities: The largest city in the IST timezone is Mumbai from India with population about 12.692 million people. Other major cities in the area are Delhi, Bangalore, Kolkata, Chennai

Daylight Saving: India Standard Time (IST) is not adjusted for daylight saving therefore IST remains the same through out the year. This means, unlike some time zones where the clock is set forward by one hour every summer and backward by one hour during winter to adjust for daylight saving, India Standard Time remains the same

IST Time Zone Geo Map
IST timezone map

IST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +0530 - basic
  • +05:30 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0530 - sign character (+) followed by a four digit time providing hours (05) and minutes (30) of the offset. Indicates five hour and thirty minutes time differences to the east of the zero meridian.
IANA/Olson: Reflects IST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Asia/Calcutta
  • Asia/Kolkata
IST Abbreviation: Several time zones share IST abbreviation and it could refer to these time zones
  • India Standard Time - UTC +5:30
  • Irish Standard Time - UTC +1
  • Israel Standard Time - UTC +2
  • Iran Standard Time - UTC +3:30

SMT

Offset: SMT is 4 hours and 42.75000000000002 minutes behind Greenwich Mean Time (GMT) and is used in America

SMT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -0443 - basic
  • -04:43 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0442 - sign character (-) followed by a four digit time providing hours (04) and minutes (42) of the offset. Indicates four hour and forty-two minutes time differences to the west of the zero meridian.