Time calculator

India Time (IST)

Live local time in India (Asia/Kolkata). Indian Standard Time is UTC+5:30 year-round with no Daylight Saving Time — one zone for the whole country.

Instant result

Result

—

Enter values to calculate.

Inputs—

Mode—

Formula—

Trust summary Engine tested · Specification checked · v1.0.1

Input interpretation: Enter values to calculate.
Result: —
Model: Current local date and time in the Asia/Kolkata time zone (Indian Standard Time).
Scope: Device clock and OS timezone database are reasonably correct.
Verification: Engine tested · Specification checked · v1.0.1
Named expert review: Optional · Not performed
Specification basis: IANA time zone database — Asia/Kolkata
Indian Standard Time (IST) = UTC+05:30
India: no Daylight Saving Time
Specification basis

Formulas

Core equations used by this calculator.

IANA zoneAsia/Kolkata

IST (year-round)UTC + 5 hours 30 minutes

iFixed half-hour offset. No DST. Prefer Asia/Kolkata — the zone is named for Kolkata even though it covers all of India.

How to use

Open the live clock

The page shows current date and time for Asia/Kolkata from your browser.

Refresh if needed

Use Refresh to re-read the clock; the display also updates about once per second.

Plan with a fixed offset

India stays on IST (UTC+5:30) all year — remember the half-hour difference.

Example calculations

Common configurations with formula and result.

Noon UTC

IST = UTC+5:30

12:00 UTC + 5 h 30 m

17:30 IST

vs Pakistan

PKT = UTC+5

IST − PKT = 30 m

India is 30 minutes ahead of Pakistan

vs Nepal

NPT = UTC+5:45

NPT − IST = 15 m

India is 15 minutes behind Nepal

vs London in winter

GMT = UTC+0

IST − GMT = 5 h 30 m

India is 5 hours 30 min ahead of GMT

India vs other zones

Common values at a glance.

City / zone	Offset	India relative
Pakistan (PKT)	UTC+5	30 minutes ahead
Nepal (NPT)	UTC+5:45	15 minutes behind
Bangkok (ICT)	UTC+7	1 hour 30 min behind
Beijing / Singapore	UTC+8	2 hours 30 min behind
Tokyo / Seoul	UTC+9	3 hours 30 min behind
London (GMT)	UTC+0	5 hours 30 min ahead
UTC	UTC+0	5 hours 30 min ahead

i When London is on BST, India’s lead is 4 hours 30 minutes. India’s own offset never changes.

India Time (IST) specification

Version 1.0.1 · Engine tested

Calculation status

Engine tested 3 published cases
Named expert review Not performed
Calculation version 1.0.1

Review policy

Definition: India uses Indian Standard Time (IST, UTC+05:30) on the IANA zone Asia/Kolkata year-round. India does not observe Daylight Saving Time. Mumbai, New Delhi, Kolkata, and Chennai share the same clock.
What it calculates: Current local date and time in the Asia/Kolkata time zone (Indian Standard Time).
Inputs: None — uses the device clock and the IANA zone Asia/Kolkata
Outputs: Local time (24-hour style from the browser formatter)
Local calendar date
Formula: Display = Intl.DateTimeFormat with timeZone Asia/Kolkata
Assumptions: Device clock and OS timezone database are reasonably correct.
Covers all of India; runs locally in the browser.
Units: Civil local time (hours, minutes, seconds)
UTC offset IST +5:30 (fixed)
Boundary conditions: No DST transitions
Half-hour offset — do not round to UTC+5 or UTC+6
Example: 12:00 UTC → 17:30 Asia/Kolkata
Validation cases: 3 published on this page
UTC 12:00 → 17:30 Asia/Kolkata
Same instant as Asia/Karachi → India is 30 minutes later
Same instant as Asia/Kathmandu → India is 15 minutes earlier
Specification basis: IANA time zone database — Asia/Kolkata
Indian Standard Time (IST) = UTC+05:30
India: no Daylight Saving Time
Calculation version: 1.0.1

Background

Interpretation and common distinctions.

Current time in India (IST)

This page shows a live local clock for India, using the IANA zone Asia/Kolkata. Time is read from your browser with that zone applied — UTC+5:30 all year.

Mumbai, New Delhi, Kolkata, and Chennai share this clock. This site’s legacy IST, Mumbai, and New Delhi URLs also point here.

Indian Standard Time (IST)

Name	Abbreviation	UTC offset	DST
Indian Standard Time	IST	UTC+5:30	None

India does not observe Daylight Saving Time. The half-hour offset matters for every conversion — do not treat IST as UTC+5.

How India time compares

Pakistan: India is 30 minutes ahead.
Nepal: India is 15 minutes behind.
Bangkok: India is 1 hour 30 minutes behind.
Singapore / Beijing: India is 2 hours 30 minutes behind.
Tokyo: India is 3 hours 30 minutes behind.
London: 5 hours 30 minutes ahead of GMT; 4 hours 30 minutes ahead of BST.
UTC: always 5 hours 30 minutes ahead.

Other calculators in this family: Nepal Time, Pakistan Time, Bangkok / Thailand Time, Singapore Time, UK / London Time, UTC Time .

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Frequently asked questions

Key distinctions behind the calculation.

What time zone is India in?

India uses Indian Standard Time (IST) at UTC+5:30. The IANA identifier is Asia/Kolkata.

Does India observe Daylight Saving Time?

No. Clocks stay on IST (UTC+5:30) year-round.

Is Mumbai the same time as New Delhi?

Yes. India has a single national time zone. This site’s legacy Mumbai and New Delhi URLs also point here.

Why is the offset +5:30 instead of a whole hour?

IST is defined as 5 hours 30 minutes ahead of UTC (historically tied to the 82.5° E meridian). Always include the half hour when converting.

Why does the IANA zone say Asia/Kolkata?

The database names the zone after a representative city. Asia/Kolkata is the canonical id for all of India.

How does India compare to Pakistan or Nepal?

India is 30 minutes ahead of Pakistan (UTC+5) and 15 minutes behind Nepal (UTC+5:45).

What is UTC?

Coordinated Universal Time is the global time standard. India is always UTC+5:30.