Timestamp Converter

Enter any number — automatically detects the timestamp type and epoch

Converter
Epoch Reference

This tool takes a single integer and tests it against a registry of known timestamp epochs and units — Unix seconds/milliseconds/microseconds/nanoseconds, Windows FILETIME, .NET DateTime.Ticks, NTP, GPS time, Apple/Cocoa time, OLE/Delphi dates, Julian Day Number and Modified Julian Date — scoring each candidate by whether the resulting calendar date falls in a plausible range. Values are handled with BigInt arithmetic so nanosecond and 100-ns-tick precision is preserved without floating point rounding.

It is useful for decoding raw numeric timestamps found in logs, databases, NTFS/LDAP metadata or API payloads without knowing in advance which epoch they use. The Epoch Reference tab lists the origin date, unit and typical digit length for each supported format.

🕐

Enter any integer — Unix timestamp, Windows FILETIME,
Java milliseconds, .NET ticks, GPS time, NTP and more.
Sub-millisecond precision is fully preserved via BigInt.

Timestamp epoch & format reference
NameEpoch (origin)UnitTypical lengthUsed by
Unix Time 1970-01-01 00:00:00 UTC seconds10 digits Linux, C, Python, PHP, databases
Java / JavaScript Time 1970-01-01 00:00:00 UTC milliseconds13 digits Java, JavaScript Date.now(), Android
Unix Microseconds 1970-01-01 00:00:00 UTC microseconds16 digits Python time.time_ns(), precise logging, databases
Unix Nanoseconds 1970-01-01 00:00:00 UTC nanoseconds19 digits Go time.Now().UnixNano(), Rust, HPC systems
Windows FILETIME 1601-01-01 00:00:00 UTC 100-ns intervals18 digits Windows API, NTFS, Active Directory, LDAP
.NET DateTime.Ticks 0001-01-01 00:00:00 UTC 100-ns intervals18–19 digits C# DateTime.Ticks
NTP Timestamp 1900-01-01 00:00:00 UTC seconds10 digits Network Time Protocol (RFC 5905)
GPS Time ⚠ 1980-01-06 00:00:00 UTC seconds10 digits GPS satellites & receivers (no leap seconds)
Apple / Cocoa Time 2001-01-01 00:00:00 UTC seconds9–10 digits macOS, iOS, Core Data, Swift
OLE / Delphi Date 1899-12-30 00:00:00 UTC days (fractional)5 digits + decimal Microsoft Excel, COM, Delphi, VBScript
Julian Day Number 4713-01-01 BC 12:00 UTC days7 digits Astronomy, calendar calculations
Modified Julian Date 1858-11-17 00:00:00 UTC days5 digits Astronomy, ESA, NASA