Timezone Converter
Convert any timestamp across multiple timezones side by side. Paste a value or use the live clock, then add the zones you need.
Timezones, offsets, and DST
The UTC offset shown for each timezone reflects the current offset at the given timestamp — not a fixed value. A timezone like America/New_York is UTC−5 in winter (EST) and UTC−4 in summer (EDT) — see When Do Clocks Change? for the exact date each year. The converter accounts for this automatically.
This is why using IANA timezone names in code is safer than hard-coding offsets. An offset of -05:00 is ambiguous — it could be New York in winter, or Lima (which never observes DST). An IANA name carries the full DST rule set — see the Timezone Abbreviations reference for why short codes like EST are ambiguous by comparison.
Frequently asked questions
How do I use the timezone converter?
Paste any Unix timestamp or date string into the input, or leave it on Now to see the current time. Your local timezone and UTC appear by default. Click 'Add time zone' to add more zones. Remove any zone with the × button.
What timestamp formats are accepted?
The same formats as the main epoch converter: Unix seconds, Unix milliseconds, ISO 8601 (2026-06-23T12:00:00Z), RFC 3339, SQL datetime (2026-06-23 12:00:00), and most natural date strings. The format is auto-detected.
What does the UTC offset show?
The offset badge (e.g. GMT-4 or GMT+5:30) shows the current offset from UTC for that timezone at the given timestamp. For timezones that observe daylight saving, this value changes depending on whether the timestamp falls in summer or winter.
Can I share the conversion with my team?
Yes. The URL encodes both the timestamp and the list of timezones. Copy the browser address and send it — whoever opens the link sees the identical set of zones and time.
Why do two cities in the same country show different offsets?
Some countries span multiple timezone rules, or different regions observe daylight saving at different times. For example, parts of Australia do not observe DST, so in summer AEST (+10) and AEDT (+11) coexist across different states.
What is IANA timezone notation?
IANA timezone names (like America/New_York or Europe/London) identify timezones unambiguously including their DST rules. They are the standard used by operating systems, databases, and programming languages. Short abbreviations like EST are ambiguous — the same string means different things in different regions.