Why DST breaks simple math
A fixed offset like UTC-5 is not always correct for a city. New York is UTC-5 during EST and UTC-4 during EDT.
Guide
How Daylight Saving Affects Time Conversion
Daylight saving time changes offsets for many cities, which can move meetings by one hour. This guide explains how to convert safely.
New York
USA · America/New York
8:56 AM
Sun, Jul 26
±0h
🌅 Early morning
London
UK · Europe/London
1:56 PM
Sun, Jul 26
+5h
🟢 Working
Mumbai
India · Asia/Kolkata
6:26 PM
Sun, Jul 26
+9h30m
🌆 Evening
Los Angeles
USA · America/Los Angeles
5:56 AM
Sun, Jul 26
-3h
🌙 Sleeping
Quick answer
Key takeaways
- DST changes local offsets by one hour in many regions.
- Not every country observes DST.
- City and date are more reliable than timezone abbreviations.
Use city plus date
For accurate conversion, enter the city and the date. A phrase like tomorrow 9am New York to London gives the converter enough context.
Watch recurring meetings
Recurring meetings are the most common DST failure. Check schedules around March, October, and November depending on the countries involved.
Frequently Asked Questions
Does DST always add one hour?
Usually yes, but rules vary by country and region.
Does India use DST?
No. India stays on IST year-round.
Why do US and UK meetings shift?
The US and UK change clocks on different dates, creating short mismatch periods.