How to Use a Time Difference Calculator
A time difference calculator converts time between two cities or time zones, accounting for UTC offsets and daylight saving time changes.
Step 1: Select your two cities
Choose the city you're calling FROM and the city you're calling TO. For example:
From: New York
To: Dubai
Step 2: Note the time difference
New York (EST, UTC-5) to Dubai (GST, UTC+4) = 9 hours ahead
So when it's 9 AM in New York, it's 6 PM in Dubai.
Step 3: Account for DST
During US daylight saving time (March-November):
New York shifts to EDT (UTC-4)
Dubai doesn't change (no DST)
Difference becomes 8 hours instead of 9
Step 4: Find overlapping business hours
New YorkDubaiStatus
7:00 AM4:00 PM✅ Both working
9:00 AM6:00 PM⚠️ End of day Dubai
11:00 AM8:00 PM❌ After hours Dubai
Common mistakes to avoid
1Forgetting DST transitions — The time difference is not constant throughout the year
2Using abbreviations ambiguously — IST could be India, Ireland, or Israel
3Not considering lunch hours — 12 PM in one zone might be midnight in another
4Ignoring weekends — Friday in one country might be Saturday/Sunday in another (especially across the Date Line)
Try our [Time Comparison tool](/tools) for instant calculations.
All articles
WorldTime Blog