How to Convert Time Zones
5 min read · Updated September 26, 2026 · by the SolveCalcPro editorial team
Converting time zones is subtraction and addition of UTC offsets — until daylight saving changes the offsets. This guide shows the method and the traps.
The method
- Find the source zone’s UTC offset on that date.
- Subtract it from the local time to get UTC.
- Add the target zone’s offset on the same date.
Example: India to New York
9:00 in India (UTC+5:30) is 03:30 UTC. New York is UTC−4 in October (daylight saving), so it is Sunday, October 4, 2026 · 23:30.
Daylight saving
The US moves clocks on the second Sunday of March and the first Sunday of November; the UK and EU on the last Sundays of March and October. India has no daylight saving. For a few weeks the gaps between these regions are an hour different from usual.
Scheduling tips
Write times with the zone and date, use 24-hour time and check the other cities with the time zone converter. It also warns about times that do not exist when clocks jump forward.
Practice questions
Test yourself, then tap to check. Answers are calculated by the tools linked below.
- A call at 21:00 in Mumbai on 12 January 2027. What time is it in London?
Show answer
London time: Tuesday, January 12, 2027 · 15:30
- What date is 6 months after 30 April 2026?
Show answer
Result: Friday, October 30, 2026
- How many hours and minutes are there between 8:00 AM and 4:30 PM?
Show answer
Elapsed time: 8h 30m
Frequently asked questions
How do I convert between time zones?
Convert to UTC with the source offset, then apply the target offset — both on the same date.
Does India have daylight saving?
No, India Standard Time is UTC+5:30 all year.
What is the time difference between India and the UK?
5½ hours in winter and 4½ hours in UK summer time.
Why can a time “not exist”?
When clocks spring forward an hour, the skipped hour never happens on the clock.
Try it yourself
Time Zone ConverterConvert a date and time between 40 major time zones, with daylight saving handled for the exact date.Date Calculator (Add or Subtract Days)Add or subtract days, weeks, months and years from any date.
Time Duration CalculatorFind the hours and minutes between two times of day, including overnight shifts.Keep learning
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