What is Timestamp Converter?

Live Unix timestamp in milliseconds and seconds. Convert epoch to date or date to timestamp. Shows UTC and your local time (IST auto-detected). Free tool. Developer utilities built for web developers, software engineers, and programmers. TekPulse's Timestamp Converter is completely free — no signup, no ads in results, and no data stored on our servers.

How to Use Timestamp Converter Online

1. Enter a Unix timestamp (e.g. 1718000000) in the top field to convert to human-readable date
2. Or enter a date and time to get the corresponding Unix timestamp
3. Select the timezone — the same timestamp shows different local times in different zones
4. View the timestamp in milliseconds, seconds, ISO 8601, and RFC 2822 formats simultaneously
5. Use the "Current Time" button to get the live Unix timestamp for right now

Timestamp Converter Formula & Calculation

A Unix/epoch timestamp counts elapsed seconds (not calendar units) since the UTC epoch, ignoring leap seconds. JavaScript's Date object internally works in milliseconds, so converting requires multiplying or dividing by 1000. Converting to a specific timezone (like IST) means adding that zone's fixed UTC offset in milliseconds — IST is UTC+5:30, so this tool adds (5×60+30)×60000 ms to a UTC timestamp to display Indian time, rather than relying on the browser's local timezone.

Example: epoch 1700000000 × 1000 = 1700000000000 ms → new Date(1700000000000) → 2023-11-14T22:13:20.000Z (UTC) → adding 5h30m → 2023-11-15 03:43:20 IST.

Key Factors That Affect Your Result

1. Seconds vs milliseconds — The most common conversion bug: Unix timestamps are in seconds (10 digits for current dates, e.g. 1700000000), but JavaScript Date() expects milliseconds (13 digits). Passing a seconds-based timestamp straight into new Date() gives a date in 1970.
2. Timezone offset vs timezone rules — A fixed offset (like IST's +5:30) works for IST because India has no daylight saving, but zones like US Eastern shift between UTC-5 and UTC-4 depending on the date — a true timezone conversion needs the IANA timezone database (Intl.DateTimeFormat), not a hardcoded offset.
3. 2038 problem — Systems storing timestamps as a signed 32-bit integer overflow on 19 January 2038. Modern JS/64-bit systems aren't affected, but older embedded or C-based systems may still be.
4. Leap seconds — Unix time ignores leap seconds entirely (every day is treated as exactly 86,400 seconds), so epoch-based calculations can drift by ~27 seconds from true UTC — irrelevant for everyday use, but matters for precise astronomical/scientific timing.

Why Use TekPulse Timestamp Converter?