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IST to F Converter

Updating current time…
IST
India Standard Time
GMT +5:30
12am
3am
6am
9am
12pm
3pm
6pm
9pm
F
Foxtrot Time Zone
GMT +6
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

5:30 pm17:30 IST (UTC+5:30), Oct 3, 2026 = 6:00 pm18:00 F (UTC+6), Oct 3, 2026

IST is 30 minutes behind F.

IST and F examples

These examples always use IST (UTC+5:30) and F (UTC+6). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

IST is 30 minutes behind F.

How the time difference changes

IST is 30 minutes behind F year-round.

Working hours of 9:00 am to 5:00 pm in IST correspond to 9:30 am to 5:30 pm in F.Working hours of 09:00 to 17:00 in IST correspond to 09:30 to 17:30 in F.

Compare IST time with F time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

India Standard Time is 30 minutes behind Foxtrot Time Zone.
5:30 pm17:30 in IST is 6:00 pm18:00 in F

IST to F call time
Best time for a conference call or a meeting is between 9am-4:30pm09:00-16:30 in IST which corresponds to 9:30am-5pm09:30-17:00 in F

5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
6:00 pm18:00 Foxtrot Time Zone (F). Offset UTC +6:00 hours

5:30 pm17:30 IST / 6:00 pm18:00 F

ISTF
12:00am12:30am
1:00am1:30am
2:00am2:30am
3:00am3:30am
4:00am4:30am
5:00am5:30am
6:00am6:30am
7:00am7:30am
8:00am8:30am
9:00am9:30am
10:00am10:30am
11:00am11:30am
12:00pm12:30pm
1:00pm1:30pm
2:00pm2:30pm
3:00pm3:30pm
4:00pm4:30pm
5:00pm5:30pm
6:00pm6:30pm
7:00pm7:30pm
8:00pm8:30pm
9:00pm9:30pm
10:00pm10:30pm
11:00pm11:30pm
00:0000:30
01:0001:30
02:0002:30
03:0003:30
04:0004:30
05:0005:30
06:0006:30
07:0007:30
08:0008:30
09:0009:30
10:0010:30
11:0011:30
12:0012:30
13:0013:30
14:0014:30
15:0015:30
16:0016:30
17:0017:30
18:0018:30
19:0019:30
20:0020:30
21:0021:30
22:0022:30
23:0023:30

India Standard Time

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

Countries using this time zone: India

Principal Cities: The largest city in the IST time zone is Mumbai in India, with about 12.692 million people. Other major cities in this time zone include Delhi, Bangalore, Chennai, Kolkata.

Daylight Saving: Clocks in India Standard Time (IST) do not change for daylight saving time, so IST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.

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 an offset of five hours and thirty minutes 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

Foxtrot Time Zone

Offset: F is 6 hours ahead Greenwich Mean Time (GMT) and is used in Military

Daylight Saving: Clocks in Foxtrot Time Zone (F) do not change for daylight saving time, so F stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.

F representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +06 - basic short
  • +0600 - basic
  • +06:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0600 - sign character (+) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates an offset of six hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Foxtrot - Military abbreviation for F
  • F - short form of 'Foxtrot'
Time zones with the GMT +6 offset:
  • ALMT - Alma-Ata Time
  • BST - Bangladesh Standard Time
  • BDT - Bangladesh Time
  • BTT - Bhutan Time
  • F - Foxtrot Time Zone
  • IOT - Indian Chagos Time
  • KGT - Kyrgyzstan Time
  • OMST - Omsk Standard Time
  • QYZT - Qyzylorda Time
  • XJT - Xinjiang Time
  • YEKST - Yekaterinburg Summer Time
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT