Current Time in IST (Indian Standard Time)
About IST
The standard time observed throughout India and Sri Lanka. It is notable for its half-hour offset from UTC. India does not observe daylight saving time, so IST is used year-round.
UTC Offset: +05:30
Current time shown is based on the representative IANA zone: Asia/Calcutta
Indian Standard Time (IST)
Indian Standard Time (IST) is the time zone observed throughout India, with a standard offset of UTC+05:30. The abbreviation IST stands for Indian Standard Time. Unlike many countries, India does not observe daylight saving time, so the offset remains constant year-round.
What Is Indian Standard Time?
Indian Standard Time (IST) is the time zone used across the entire Republic of India. It is calculated from the 82.5°E meridian, which passes through the city of Mirzapur in Uttar Pradesh. The offset of UTC+05:30 places IST 5 hours and 30 minutes ahead of Coordinated Universal Time (UTC). The IANA time zone database includes two identifiers for this zone: Asia/Calcutta and Asia/Kolkata, both referring to the same time offset and rules.
Standard Offset and Daylight Saving
IST has a fixed offset of UTC+05:30. India does not observe daylight saving time (DST). There have been occasional proposals and experiments (e.g., during the China-India War in 1962 and the Indo-Pakistani wars in 1965 and 1971), but no permanent DST has been implemented. Therefore, the time difference with other regions remains constant throughout the year.
Regions and Cities Covered
IST is the sole time zone for all of India, which spans from the western state of Gujarat to the eastern state of Arunachal Pradesh. Major cities include New Delhi (the capital), Mumbai, Kolkata, Chennai, Bengaluru, Hyderabad, Ahmedabad, Pune, and Jaipur. The entire country, including all union territories, operates on IST.
Differences from Neighboring Zones
India's time zone differs from its neighbors as follows:
- Pakistan (PKT, UTC+05:00): IST is 30 minutes ahead of Pakistan Standard Time.
- Nepal (NPT, UTC+05:45): IST is 15 minutes behind Nepal Time.
- Bangladesh (BST, UTC+06:00): IST is 30 minutes behind Bangladesh Standard Time.
- Sri Lanka (SLST, UTC+05:30): Sri Lanka uses the same offset as IST, so there is no difference.
- Myanmar (MMT, UTC+06:30): IST is 1 hour behind Myanmar Time.
- China (CST, UTC+08:00): IST is 2 hours and 30 minutes behind China Standard Time.
Notably, India's half-hour offset creates unique time differences, such as the 30-minute gap with Pakistan and the 15-minute gap with Nepal.
Practical Business-Hours Guidance
For international business coordination, the typical Indian workday runs from 9:00 AM to 6:00 PM IST (3:30 AM to 12:30 PM UTC). Overlap with major financial centers:
- New York (EST, UTC-05:00): Overlap from 9:00 AM IST (10:30 PM EST previous day) to 6:00 PM IST (7:30 AM EST). Best overlap is 10:00 AM to 12:30 PM IST (11:30 PM to 2:00 AM EST).
- London (GMT, UTC+00:00): Overlap from 9:00 AM IST (3:30 AM GMT) to 6:00 PM IST (12:30 PM GMT). Best overlap is 1:30 PM to 5:30 PM IST (8:00 AM to 12:00 PM GMT).
- Dubai (GST, UTC+04:00): Overlap from 9:00 AM IST (7:30 AM GST) to 6:00 PM IST (4:30 PM GST). Full overlap.
- Singapore (SGT, UTC+08:00): Overlap from 9:00 AM IST (11:30 AM SGT) to 6:00 PM IST (8:30 PM SGT). Full overlap.
- Tokyo (JST, UTC+09:00): Overlap from 9:00 AM IST (12:30 PM JST) to 6:00 PM IST (9:30 PM JST). Full overlap.
For conference calls, aim for 10:00 AM to 12:00 PM IST for US East Coast, and 1:30 PM to 3:30 PM IST for Europe.
Frequently Asked Questions
What does IST stand for?
IST stands for Indian Standard Time. It is the time zone used throughout India with a UTC offset of +05:30.
Does India observe daylight saving time?
No, India does not observe daylight saving time. The offset remains UTC+05:30 all year round.
Why does India have a half-hour offset?
India's time zone is based on the 82.5°E meridian, which passes through Mirzapur. The half-hour offset was chosen to keep the time close to the mean solar time across the country's wide longitudinal extent.
What is the time difference between IST and Pakistan Standard Time?
IST is 30 minutes ahead of Pakistan Standard Time (PKT, UTC+05:00). For example, when it is 12:00 PM IST, it is 11:30 AM in Pakistan.
Which IANA time zone identifiers are used for IST?
The IANA identifiers are Asia/Calcutta and Asia/Kolkata. Both represent the same time zone (IST).
What is the best time to schedule a call between India and New York?
The best overlap is between 10:00 AM and 12:30 PM IST, which corresponds to 11:30 PM to 2:00 AM EST (previous day) in New York.