India, US East Coast, Dubai and Australia team clock

When is everyone in?

The tables below assume a nine-to-six day in each city and count, for every hour of Kolkata's day, how many of the 4 offices are inside theirs. That is an assumption, printed so you can see it — not a recommendation, because nothing here knows anyone's real hours. There is one table per arrangement of the clocks, because 3 different arrangements occur during 2026.

The arrangements, with dates

Kolkata on IST, New York on EDT, Dubai on GST, Sydney on AEST

4 Apr – 3 Oct 2026. Never all 4 at work in a nine-to-six day; at most 3 of 4, at 11:00am – 2:00pm Kolkata time.

Kolkata on IST, New York on EST, Dubai on GST, Sydney on AEDT

1 Jan – 8 Mar 2026; 1 Nov – 31 Dec 2026. Never all 4 at work in a nine-to-six day; at most 3 of 4, at 11:00am – 1:00pm Kolkata time. At least one office is open at every hour.

Kolkata on IST, New York on EDT, Dubai on GST, Sydney on AEDT

8 Mar – 4 Apr 2026; 3 Oct – 1 Nov 2026. Never all 4 at work in a nine-to-six day; at most 3 of 4, at 11:00am – 1:00pm Kolkata time. At least one office is open at every hour.

Shaded cells are inside that city's nine-to-six; a highlighted row has every office in. For a different working day or another city, use the timeline above — the daylight colour on each band is the same question answered by the sun.

Working across Kolkata, New York, Dubai, Sydney

This is the footprint of an Indian IT company that has grown the way they usually grow: a Gulf office because the customers are there, an Australian office because the time zone is kind, and a US East Coast presence because that is where the revenue is. The four cities are spread across almost the entire clock — Sydney is four and a half or five and a half hours ahead of India, Dubai an hour and a half behind, New York nine and a half or ten and a half behind — so the day passes through them in order: Sydney first, then India, then Dubai, then, much later, New York.

Three of the four can be at work together, and the tables below show when. Sydney's afternoon, India's late morning and Dubai's early morning coincide for a few hours — India between roughly 10:30am and 1:30pm in the Australian winter, an hour less in the Australian summer — and that window is where an APAC-plus-Gulf standup lives. New York never joins it. New York's morning is India's evening, Dubai's late afternoon and Sydney's night, so a four-way meeting is somebody's midnight by construction, and the honest thing the timeline above does is show whose.

Two of the four change their clocks, in opposite seasons, which makes this the footprint whose picture changes most often: New York moves in March and November, Sydney in April and October, so there are four different arrangements a year, each with its own table below. India and Dubai never move. A recurring Sydney–India call is fixed for six months at a time; a recurring New York–India one likewise; a recurring Sydney–New York one shifts four times a year and is fourteen, fifteen or sixteen hours apart depending on the month.

Weekends are the other axis. The UAE has worked Monday to Friday since 2022, so Dubai now lines up with the other three for four and a half days; the Friday afternoon gap is real but small. What still catches teams out is the date: Sydney's Monday morning is India's Sunday night and New York's Sunday afternoon, and a Friday-evening deployment from New York lands on Saturday morning in India and Saturday evening in Sydney. The vertical rules on the bands above mark each city's midnight for exactly this reason.

The cities stand in for their regions. All of India keeps Kolkata's clock; Abu Dhabi and Muscat keep Dubai's; Melbourne and Canberra keep Sydney's, though Brisbane does not observe daylight saving and Perth is on Singapore's clock; the whole US East Coast and Toronto keep New York's. Add the specific office in the tool above if it helps the team see itself.

Sources

The offsets, dates and hour tables above are computed when this page is built, from the time zone rules your browser itself ships. The rules come from:

• IANA Time Zone Database — the rules every browser ships
• NIST — Daylight Saving Time rules (United States)
• ECMA-402 — the Intl.DateTimeFormat standard these figures are computed with