IST — India, Irish or Israel Standard Time

IST is ambiguous: it stands for 3 different times, all in use today. When a message says “IST”, the sender’s country usually tells you which one is meant; to be safe, write the UTC offset (for example IST = UTC+5:30, IST = UTC+1 or IST = UTC+2).

India Standard Time · UTC+5:30 · India
Irish Standard Time · UTC+1 · Ireland
Israel Standard Time · UTC+2 · Israel

India Standard Time

UTC+05:30

Tue, Sep 29 time in Asia/Kolkata UTC+5:30

IST stands for India Standard Time, UTC+5:30, 5 hours 30 minutes ahead of UTC. It is used all year in India.

Countries and territories: India.

Zones: Asia/Kolkata.

Irish Standard Time

UTC+01:00

Tue, Sep 29 time in Europe/Dublin UTC+1

IST stands for Irish Standard Time, UTC+1, 1 hour ahead of UTC. It is used in summer in Ireland.

Legally Ireland’s standard time; used in summer.

Countries and territories: Ireland.

Zones: Europe/Dublin.

Israel Standard Time

UTC+03:00

Tue, Sep 29 time in Asia/Jerusalem UTC+3

IST stands for Israel Standard Time, UTC+2, 2 hours ahead of UTC. It is used in winter in Israel; from the Friday before the last Sunday in March at 02:00 to the last Sunday in October at 02:00, the same places switch to IDT (UTC+3).

Countries and territories: Israel.

Zones: Asia/Jerusalem.