What is Timezone Converter?
Timezone Converter converts any time from one timezone to another — handling daylight saving time automatically. Find the right hour to schedule a call across continents, or verify what time a server log entry corresponds to locally.
With 38+ distinct UTC offsets in active use, timezone math is one of the most common sources of scheduling mistakes. Always use a converter — never calculate offsets manually.
Key Timezone Concepts
UTC Offset
Every timezone is defined as UTC plus or minus a number of hours (and sometimes 30 or 45 minutes). India is UTC+5:30, for example.
Daylight Saving
About 70 countries shift clocks forward in summer and back in winter. DST dates vary by country. The converter handles this automatically.
IANA Timezone IDs
The definitive timezone identifier format: Region/City (e.g. America/New_York, Europe/London). Unambiguous and DST-aware.
Same Moment, Different Display
A timezone doesn't change when something happens — only how that moment is displayed locally.
How to Use Timezone Converter
Enter the source time
Type a time (12:00 PM) or use the picker. Select the source timezone from the dropdown.
Choose the date
The date matters for DST-aware conversions — the same time can have different offsets in winter vs summer.
Pick target timezone
Select the timezone you want to convert to. Search by city name for quick lookup.
Read the converted time
The equivalent time in the target timezone appears, with UTC offset shown for both zones.
Common Timezone Reference
| City | IANA ID | UTC Offset (Standard) |
|---|---|---|
| New York | America/New_York | UTC-5 (EST) / UTC-4 (EDT) |
| London | Europe/London | UTC+0 (GMT) / UTC+1 (BST) |
| Mumbai | Asia/Kolkata | UTC+5:30 (no DST) |
| Singapore | Asia/Singapore | UTC+8 (no DST) |
| Tokyo | Asia/Tokyo | UTC+9 (no DST) |
| Sydney | Australia/Sydney | UTC+10 / UTC+11 |
Tips & Common Mistakes
Schedule meetings in UTC, display locally. Tell participants “the call is 14:00 UTC” and let each person convert to their own timezone. This avoids DST confusion and is unambiguous.
Don’t use abbreviations like IST, CST, or PST in international communication — they’re ambiguous (CST is Central Standard Time in the US AND China Standard Time). Use UTC offsets or IANA city names instead.
Re-check around DST transition dates. A meeting scheduled for 2 weeks from now may fall on the other side of a DST change. Always verify with a converter on the specific meeting date.
Related Tools
- Epoch Converter — convert UTC timestamps to any local timezone
- Date Difference — calculate days between dates across timezones
- Business Days Calculator — count working days in a target timezone