Time-zone abbreviation
IST — India Standard Time & Israel Standard Time & Irish Standard Time
IST is one of the most overloaded abbreviations in common use. India Standard Time (UTC+5:30) is by far the largest population; Israel Standard Time (UTC+2) is also abbreviated IST and shifts to IDT in summer; and Ireland's summer time is called Irish Standard Time (UTC+1). Always confirm which IST is meant — the three zones are hours apart.
Last updated · Maintained by Clockjumper
IST refers to more than one time zone
India Standard Time (UTC+5:30)
Current time in India Standard Time
9:02 AM
Friday, Jul 3
Asia/Kolkata
Quick facts
- Standard offset
- UTC+5:30 (IST)
- Daylight saving
- Not observed — offset stays the same year-round
- Next clock change
- None scheduled in the next 12 months for India Standard Time
- Where it's used
- The single official time zone for all of India and Sri Lanka. Five and a half hours ahead of UTC, with no daylight saving.
Israel Standard Time (UTC+2)
Current time in Israel Standard Time
6:32 AM
Friday, Jul 3
Asia/Jerusalem
Quick facts
- Standard offset
- UTC+2 (IST)
- Daylight saving
- Yes — shifts to IDT (UTC+3)
- Next clock change
- Where it's used
- Used across Israel and the Palestinian territories. Two hours ahead of UTC, shifting to Israel Daylight Time (IDT, UTC+3) in summer on locally legislated dates.
Irish Standard Time (UTC+1)
Current time in Irish Standard Time
4:32 AM
Friday, Jul 3
Europe/Dublin
Quick facts
- Standard offset
- UTC+1 (IST)
- Daylight saving
- Not observed — offset stays the same year-round
- Next clock change
- None scheduled in the next 12 months for Irish Standard Time
- Where it's used
- Ireland's legal summer time. The Republic of Ireland is on GMT in winter and switches to IST (UTC+1) on the last Sunday of March, returning to GMT on the last Sunday of October.
Cities in Irish Standard Time
Convert IST to your time zone
Need to convert a specific time? Use the Clockjumper converter, or jump to one of these popular IST conversions:
Frequently asked questions
- What does IST stand for?
- IST is used for more than one time zone: India Standard Time (UTC+5:30), Israel Standard Time (UTC+2), Irish Standard Time (UTC+1).
- What is the UTC offset of IST?
- India Standard Time is UTC+5:30; Israel Standard Time is UTC+2, shifting to UTC+3 in summer; Irish Standard Time is UTC+1.
- Does IST observe daylight saving time?
- India Standard Time does not observe DST; Israel Standard Time observes DST and switches to IDT; Irish Standard Time does not observe DST.
- Is IST the same as Israel Standard Time?
- Not exactly. The letters IST are reused. India Standard Time is UTC+5:30 and Israel Standard Time is UTC+2 — the two zones are 3.5 hours apart.
- Is IST the same as Irish Standard Time?
- Not exactly. The letters IST are reused. India Standard Time is UTC+5:30 and Irish Standard Time is UTC+1 — the two zones are 4.5 hours apart.
- Is IST the same as Irish Standard Time?
- Not exactly. The letters IST are reused. Israel Standard Time is UTC+2 and Irish Standard Time is UTC+1 — the two zones are 1 hours apart.