Every tool on parsetime

Converters and decoders for every way a timestamp gets written: standard formats, the identifier schemes that smuggle a date inside an ID, timezone conversions, and live clocks. All free, no signup, and everything runs in your browser. Each one is also available as JSON through the API. Short guides answer the questions behind them, such as why a timestamp has 13 digits.

Timestamp decoders

IDs and serial numbers that carry their creation time inside them.

Snowflake ID to timestampConvert a Discord snowflake ID to the exact date and time it was created. Works for user, message, and server IDs. Free, instant, in your browser.Excel serial date to real dateConvert an Excel serial date number like 45261 to a real date and time. Handles time-of-day fractions and explains the 1900 leap-year quirk..NET ticks to dateConvert a .NET DateTime.Ticks value (100-nanosecond intervals since year 0001) to a readable date, Unix timestamp, and ISO 8601, instantly.LDAP timestamp to dateConvert an 18-digit LDAP / Active Directory timestamp (Windows FILETIME) like lastLogon or pwdLastSet to a readable date and your timezone.Chrome (WebKit) timestamp to dateConvert a 17-digit Chrome/WebKit timestamp from a History or Cookies database to a readable date. Microseconds since 1601, decoded instantly.MongoDB ObjectId to timestampExtract the creation time from a MongoDB ObjectId. The first 4 bytes are a Unix timestamp; paste an ObjectId to see when the document was created.UUID or ULID to timestampExtract the embedded timestamp from a UUID (v1, v6, v7) or ULID. Paste an id and see exactly when it was generated. Free and in your browser.Cocoa timestamp to dateConvert an Apple Cocoa / Core Data timestamp (seconds since 2001-01-01, also called Mac Absolute Time) to a readable date and your timezone.Hex timestamp to dateConvert a hexadecimal Unix timestamp like 0x6553f400 to a readable date. Detects seconds vs milliseconds automatically. Free, instant, in-browser.Julian Date to calendar dateConvert a Julian Date (JD) like 2460000.5 or a Modified Julian Date (MJD) like 60000 to a calendar date and Unix timestamp. Free and in your browser.GPS time to UTCConvert GPS time to UTC: seconds since the GPS epoch of 6 January 1980, or a week number and time of week. Leap seconds are applied, so you get real UTC.NTP timestamp to dateConvert an NTP timestamp, seconds since 1 January 1900 in decimal or 64-bit hex, to a readable date and Unix time, with the 2036 era rollover explained.HFS+ timestamp to dateConvert a Mac HFS+ timestamp, seconds since 1 January 1904, to a readable date and Unix time. Covers the classic HFS local-time quirk and the 2040 limit.SAS datetime to calendar dateConvert a SAS datetime, seconds since 1 January 1960, or a SAS date in days to a readable date and Unix timestamp. Tells you which reading it used. Free.

Guides

The questions behind the converters, answered, with the converter under each one.

Why is my timestamp 13 digits?A 13-digit timestamp is Unix time in milliseconds, not seconds. How to tell the unit by length, why mixing them gives 1970 or year 55840, and the fix.What does an ISO 8601 timestamp without a timezone mean?An ISO 8601 timestamp with no Z or offset is local time, not UTC. Why JavaScript, Python and databases read it differently, and the safe fix.Seconds vs milliseconds vs nanoseconds: which unit is a timestamp in?Unix timestamps come in seconds, milliseconds, microseconds and nanoseconds. How to tell them apart, the 2262 and 2^53 limits, and how to convert safely.What is the Year 2038 problem?Signed 32-bit Unix time overflows at 2038-01-19T03:14:07Z and wraps to 1901. Where 32-bit time_t still lives, what 64-bit fixes and how to test for it.What is Zulu time?Zulu time is UTC: Z is the zero-offset zone designator, spoken as Zulu. Where it appears in aviation, METAR and ISO 8601, and how it differs from GMT.

Date calculators & schedule tools

Date arithmetic, week numbers, cron schedules, and Discord timestamps.

Days between two datesCount the days between two dates, plus weeks, months, years, and weekdays only. Free date duration calculator that handles leap years correctly.Add days to a dateAdd or subtract days, weeks, months, or years from any date and get the resulting date with its weekday. Free, instant, leap-year aware.What week of the year is it?Get the ISO 8601 week number for today or any date, plus the US Sunday-start convention, which often differs. Free week number calculator.Day of the yearWhat day of the year is it? Get the day number (1–366) for today or any date, days remaining in the year, and the ISO week. Free and instant.Cron expression parserPaste a cron expression and get it explained in plain English, with the next 10 run times in any timezone. Handles names, steps, ranges, and DST.Discord timestamp generatorGenerate Discord dynamic timestamps (<t:unix:R> markup) for any date. All 7 styles with live previews and one-click copy. Free, in your browser.

Format converters

The standard ways of writing a moment in time.

Unix timestamp converterConvert a Unix timestamp (epoch seconds, milliseconds, microseconds, or nanoseconds) to a human-readable date in your timezone, UTC, and ISO 8601.Epoch time converterConvert epoch time to a human date and back. Supports epoch seconds and milliseconds, with output in your timezone, UTC, ISO 8601, and Unix time.ISO 8601 timestamp converterConvert an ISO 8601 timestamp (like 2026-06-01T11:10:52Z) to your local timezone, UTC, Unix time, and other cities, instantly, in your browser.Milliseconds (epoch) to dateConvert epoch milliseconds (a 13-digit timestamp like 1700000000000) to a human-readable date in your timezone, UTC, and ISO 8601.Date to Unix timestampConvert a human date or ISO string to a Unix timestamp (epoch seconds and milliseconds), plus UTC and your local time.

Timestamps in your language

Copy-paste snippets: current timestamp, convert, and parse, with the gotchas.

Python JavaScript Java C#PHP Go Ruby Rust Bash Swift

For developers

Free JSON API, no key or signupEvery tool above is one GET away, including the decoders: /api/t/<value>?format=ldap.