Every developer has needed to decode a Unix timestamp at 11pm with no tools to hand. Every genealogist has wondered what day of the week their ancestor was born, or how many days separated two historical events. Type anything below — this tool handles the rest simultaneously, and shows you the working.
Unix timestamp → 1735689600
ISO 8601 → 2026-01-01T00:00:00Z
British → 1 January 2026
US → January 1, 2026
Relative → today yesterday 3 days ago 2 weeks hence
Human-Readable Dates
Machine Formats
Calendar & Position
Elapsed & Relative Time
Historical & Astronomical
Calendar Notes