IDT time now (Israel Daylight Time)

What IDT means

IDT stands for Israel Daylight Time, UTC+3. It is used in Israel.

It is a summer time: the daylight saving form of IST (UTC+5:30), one hour ahead. In Jerusalem it applies from March to October/November: from the fourth Thursday of March at 2:00 PM to the last Sunday of October at 2:00 AM.

IST means three different things

IST is the standard abbreviation of India Standard Time, UTC+5:30, the single time of all of India (Sri Lanka uses the same offset). The same letters are used for Israel Standard Time (UTC+2, in winter) and Irish Standard Time (UTC+1, Ireland’s summer time). tzdata uses IST for all three.

The spread is 3½ hours, enough to wreck a meeting. A message from Dublin in August saying “10:00 IST” means 09:00 UTC; the same text from Tel Aviv in January means 08:00 UTC, and from Bengaluru 04:30 UTC. When the context is not obvious, write UTC+5:30 or the city.

India Standard Time has stayed at UTC+5:30 without daylight saving time since 1945, according to tzdata. Israel changes clocks between IST and IDT (UTC+3) every year.

Where and when IDT is used

1 zone uses it for part of the year only, switching back to standard time in the other months. Computed from tzdata under the current rules.

How long IDT has been used

In the tzdata record, Jerusalem has used IDT since 1940.

IDT in the past

Zones whose tzdata history shows IDT before 2025 but that no longer use it:

• Asia/Gaza (Gaza): 1974–1995
• Asia/Hebron (East Jerusalem): 1974–1995

IDT converted to other zones

Every column is a fixed offset, so this table is valid on any date. Remember that the regions behind some columns switch to summer time (EST to EDT, CET to CEST, GMT to BST); the clock in those cities is then an hour later than the column.

Related zones and conversions

• IST time
• Asia/Jerusalem time zone
• UTC+3 time
• Time zones of the world
• Daylight saving time
• Time zone converter