Mumbai
UTC+5:30India · IST
Thu, 13 Aug 2026
Timezone Guide
Mumbai, India runs on UTC+5:30. This time zone stays fixed year-round at UTC+5:30 — daylight saving time is not observed. There is a 9.5-hour difference between Mumbai and New York. Standard working hours don't overlap at all with New York, so meetings need an early or late slot on one side. There is a 4.5-hour difference between Mumbai and London. Standard 9-to-6 working hours overlap for about 4.5 hours a day with London. A good time to connect: 13:30–18:00 in Mumbai lines up with 09:00–13:30 in London. There is a 3.5-hour difference between Mumbai and Tokyo. Standard 9-to-6 working hours overlap for about 5.5 hours a day with Tokyo. A good time to connect: 09:00–14:30 in Mumbai lines up with 12:30–18:00 in Tokyo. This timezone is also shared with cities such as Delhi. Keeping these offsets in mind makes it easier to schedule calls or travel to and from Mumbai.
Practical Info
Mumbai (India) is home to roughly 21.7M people. Today brings about 13.2 hours of daylight: sunrise at 06:00, sunset at 19:12. This time zone stays fixed year-round at UTC+5:30 — daylight saving time is not observed. It sits in the Northern Hemisphere, about 19° north of the equator. Traffic drives on the left.
Flag
India
Capital
New Delhi
Continent
Asia
Time Zone
IST · Asia/Kolkata
Coordinates
19.10°N, 72.88°E
Currency
INR (₹)
Calling Code
+91
Driving Side
Left
Hemisphere
Northern
Language
Hindi, English
Measurement System
Metric
Did You Know?
For Fifty Years, Two Clocks Faced Each Other Across a Bombay Square, 38 Minutes Apart
Until 1955, Bombay kept its own time. Bombay Time ran 38 minutes and 50 seconds behind Indian Standard Time, and which clock you used said something about who you were.
The fight started early. A first attempt to impose a single time on the city failed in 1870. In 1881 the governor, Sir James Fergusson, ordered all government offices onto railway time and invited the public to follow. The city was unimpressed — a rumour went round that the governor's sudden enthusiasm for standardisation had rather a lot to do with him having twice missed trains. The government was forced to restore local time in 1883.
That same year, the senate of Bombay University spent a meeting arguing about what time the university's new 280-foot clock tower should keep. One member's argument was simply that the clock and the tower belonged to Bombay, so they should keep Bombay's time.
Then in 1905–06 the Viceroy, Lord Curzon, imposed Indian Standard Time nationally. This was the same Curzon who had just partitioned Bengal, and in Bombay, refusing his clock became a way of refusing him. Public clock towers were stoned. Office workers and factory workers struck. A petition against IST was signed on the grounds that it was contrary to the principles of modern science.
At the Jacob Sassoon Mill, more than 2,000 workers gathered and wrecked the timekeeper's office, because the new time meant starting work before dawn. The mill gave ground and let them start at 6 a.m. Bombay Time — 6:39 a.m. Standard Time — which is to say, at sunrise.
The clock: and then the city simply ran on both, for fifty years.
Newspapers printed the daily list of engagements with "BT" or "ST" beside each entry, so you knew which time — and which politics — the event belonged to. The clock crowning Victoria Terminus showed Standard Time. Directly across the square, the Municipal Corporation's clocks showed Bombay Time. The two faced each other, thirty-eight minutes apart, for half a century.
Madras Time was phased out. Calcutta Time lasted until 1948. Bombay held out until 1955 — and even afterwards, Parsi fire temples kept using it for rituals, and Mumbaikars went on saying they were "running on Bombay Time" when they turned up late.
Sources
- bombaywiki (CAMP), *Bombay Time* (tam olarak 38 dakika 50 saniye; Victoria Terminus ve Belediye saatlerinin karşılıklı durması)
- Atlas Obscura, *The Long History of 'Bombay Time' and Resistance to Colonial Rule* (1870 ve 1881 girişimleri; Rajabai kulesi tartışması; Jacob Sassoon Fabrikası'nda 2.000+ işçi)
- Shekhar Krishnan, *Bombay Time: Clock Work in the Colonial City, 1870–1955*
- Live History India, *When Setting the Clock Divided the Subcontinent* (gazetelerdeki BT/ST işaretleri; Jim Masselos alıntısı; Kalküta 1948, Bombay 1955)
- Oxford ORA, *The Politics of Time in Colonial Bombay* (Fergusson'un treni kaçırma söylentisi; 1883'te geri adım)
Annual Daylight
Working Hours
6.5h overlap