IST to UTC Converter

Use this IST to UTC Converter to convert India Standard Time to Coordinated Universal Time for software development, server configuration, API integration, database storage, and global scheduling.

Quick Answer: Indian Standard Time (IST) is UTC+5:30. Coordinated Universal Time (UTC) is UTC+0. To convert IST to UTC, always subtract 5 hours and 30 minutes. This offset never changes — neither IST nor UTC observes Daylight Saving Time. The IST to UTC conversion is the same every single day of the year.

Why IST to UTC Is Always the Same

The IST to UTC conversion is unique among all the conversions on this site — there is absolutely no seasonal variation, no DST consideration, and no “it depends on the date” qualification.

IST (Indian Standard Time) is UTC+5:30, fixed year-round. India has never observed Daylight Saving Time since adopting IST in 1905. IST is always UTC+5:30, every hour of every day.

UTC (Coordinated Universal Time) is UTC+0, the global reference standard. It is maintained by atomic clocks and never adjusts for any season. UTC is always UTC+0.

The result: subtract 5 hours and 30 minutes from any IST time to get UTC. Always. No exceptions.

IST to UTC Conversion Table (Full 24 Hours)

What Is IST (Indian Standard Time)?

Indian Standard Time (IST) is UTC+5:30 — 5 hours and 30 minutes ahead of Coordinated Universal Time. It is the single, unified time zone used across all of India, covering approximately 1.4 billion people.

India adopted its national time zone in 1905, aligning to the 82.5° East meridian through Allahabad, Uttar Pradesh. The resulting UTC+5:30 offset is a half-hour increment rather than a whole hour — one of only a few such offsets in the world. India has never observed Daylight Saving Time. IST is UTC+5:30 every single day of the year, with no exceptions.

The IANA timezone identifier for IST is Asia/Kolkata. Key cities: Mumbai, New Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad.

What Is UTC (Coordinated Universal Time)?

Coordinated Universal Time (UTC) is the global standard for timekeeping, maintained by over 400 atomic clocks across 50+ countries. It is the reference point from which all other time zones are measured and is identified in the IANA Time Zone Database as UTC or Etc/UTC.

UTC is used universally in software, aviation, finance, science, and internet infrastructure. It never observes Daylight Saving Time and never changes offset. UTC+0 is always UTC+0.

IST to UTC for Developers

Converting IST to UTC is one of the most common tasks for Indian developers working with global systems.

Why you always store in UTC: When you store timestamps in UTC, they are unambiguous regardless of the user’s location, server timezone, or seasonal clock changes. Converting to IST at display time using Asia/Kolkata ensures correctness for Indian users without polluting your data layer.

Converting IST to UTC in code:

javascript

// JavaScript — converting IST display time to UTC for storage
const istDate = new Date('2026-06-22T20:00:00+05:30');
const utcString = istDate.toISOString();
// Result: "2026-06-22T14:30:00.000Z" (UTC)

python

# Python — using pytz
from datetime import datetime
import pytz

ist_tz = pytz.timezone('Asia/Kolkata')
ist_time = ist_tz.localize(datetime(2026, 6, 22, 20, 0, 0))
utc_time = ist_time.astimezone(pytz.utc)
# Result: 2026-06-22 14:30:00+00:00

sql

-- SQL (PostgreSQL) — store as UTC
INSERT INTO events (event_time)
VALUES ('2026-06-22 20:00:00+05:30'::timestamptz AT TIME ZONE 'UTC');

The manual formula: UTC = IST − 5 hours 30 minutes = IST − 330 minutes

If the result is negative (crosses midnight), add 24 hours and subtract one calendar day.

Key Reference Points — IST to UTC

These are the most useful reference anchors for working with IST and UTC together:

• 5:30 AM IST = 00:00 UTC — IST midnight UTC anchor
• 11:30 AM IST = 06:00 UTC — IST morning / UTC early morning
• 5:30 PM IST = 12:00 UTC — IST evening / UTC noon
• 11:30 PM IST = 18:00 UTC — IST late night / UTC early evening

The 5:30 AM IST = midnight UTC relationship is particularly useful for scheduled jobs, cron tasks, and batch processes that need to run at UTC midnight.

Need to Convert UTC to IST Instead?

→ UTC to IST Converter

Quick reference:

FAQs

What is the time difference between IST and UTC?

UTC is always exactly 5 hours and 30 minutes behind IST. This difference never changes — neither IST nor UTC observes Daylight Saving Time. The IST to UTC conversion is the same on every day of the year, in every season, without exception.

How do I convert IST to UTC?

To convert IST to UTC, subtract 5 hours and 30 minutes. For example, 8:00 PM IST equals 2:30 PM UTC. If the result goes before midnight, it falls on the previous calendar day. The formula never changes regardless of the time of year.

What is 9 AM IST in UTC?

9:00 AM IST equals 03:30 UTC on the same calendar day.

What is 5:30 AM IST in UTC?

5:30 AM IST equals 00:00 UTC (midnight). This is the key anchor point — whenever it is 5:30 AM in India, it is exactly midnight UTC.

What is 8 PM IST in UTC?

8:00 PM IST equals 14:30 UTC (2:30 PM UTC) on the same calendar day.

What is midnight (12 AM) IST in UTC?

12:00 AM (midnight) IST equals 18:30 UTC (6:30 PM) on the previous calendar day.

Does converting IST to UTC change during Indian summer?

No. India does not observe Daylight Saving Time and has never done so. IST is always UTC+5:30, meaning UTC is always exactly 5 hours and 30 minutes behind IST, year-round with no seasonal variation.

Why subtract 5 hours 30 minutes when converting IST to UTC?

IST is defined as UTC+5:30, meaning India is 5 hours and 30 minutes ahead of UTC. To go from a time that is “ahead” back to the reference point, you subtract the offset. UTC = IST − 5:30. The 30-minute component exists because IST was set to align with the 82.5° East meridian, which falls at a longitude corresponding to a half-hour increment.

What is 5:30 PM IST in UTC?

5:30 PM IST equals 12:00 UTC (noon). Whenever it is 5:30 PM in India, it is exactly noon UTC.

What is 12 PM IST in UTC?

12:00 PM (noon) IST equals 06:30 UTC on the same calendar day.

What is 6 PM IST in UTC?

6:00 PM IST equals 12:30 UTC (12:30 PM) on the same calendar day.

How should I handle IST timestamps in my API?

Always accept, store, and return timestamps in UTC in your API. Use ISO 8601 format with the Z suffix (e.g., 2026-06-22T14:30:00Z) to indicate UTC explicitly. When displaying times to Indian users, convert from UTC to IST using the Asia/Kolkata IANA timezone identifier in your frontend or application layer. Never store IST timestamps directly in your database.

What is 11 PM IST in UTC?

11:00 PM IST equals 17:30 UTC (5:30 PM) on the same calendar day.

What is 1 PM IST in UTC?

1:00 PM IST equals 07:30 UTC on the same calendar day.

What is 10 AM IST in UTC?

10:00 AM IST equals 04:30 UTC on the same calendar day.

Is IST to UTC conversion affected by leap years?

No. Leap years add a day to the calendar but do not affect timezone offsets. IST is always UTC+5:30 on every day including February 29 in a leap year.

What is the IST offset in minutes?

IST is UTC+330 minutes (5 hours × 60 + 30 minutes = 330 minutes). To convert IST to UTC programmatically using Unix timestamps or epoch values, subtract 330 × 60 = 19,800 seconds from the IST timestamp.

About IST and UTC

Indian Standard Time (IST) is UTC+5:30, identified in the IANA Time Zone Database as Asia/Kolkata. India uses a single time zone despite spanning roughly 30 degrees of longitude — a policy in place since 1905. IST is fixed and never adjusts for daylight saving, making it one of the most stable time zones for software and systems work.

Coordinated Universal Time (UTC) is the global timekeeping standard maintained by the Bureau International des Poids et Mesures (BIPM). It is identified as UTC in the IANA Time Zone Database. All major programming languages, operating systems, databases, and internet protocols use UTC as their internal time reference. The relationship between IST and UTC is among the most important for India’s software industry — India is the world’s largest exporter of IT services, and virtually all cross-border system integration involves converting between IST and UTC.

Author & Methodology

Author: CalculatorGeek Editorial Team

Reviewed by: CalculatorGeek Technical Review Team

Last reviewed: June 2026

Methodology: This converter uses IANA timezone identifiers (Asia/Kolkata for IST, UTC for Coordinated Universal Time). Since neither timezone observes Daylight Saving Time, no date-aware offset logic is required — the offset is permanently fixed at −5:30 when converting from IST to UTC.

References:

• IANA Time Zone Database — official source for UTC offsets and timezone identifiers worldwide
• MDN Web Docs — Intl.DateTimeFormat — browser implementation of IANA timezone formatting using Asia/Kolkata
• India Standard Time — Wikipedia — confirms IST is UTC+5:30 with no DST observance
• BIPM — International Bureau of Weights and Measures — official source for UTC definition and atomic clock network

Also useful:

• UTC to IST Converter
• IST to EST Converter
• IST to GMT Converter
• All Time Zone Converters