Unix timestamp converter
Convert Unix seconds, milliseconds or a date into ISO, UTC and local formats.
DATE & TIME COLLECTION
Convert timestamps and compare dates carefully.
Date calculations become unreliable when seconds, milliseconds, time zones and ambiguous input formats are mixed. These tools expose the representation so you can check the assumption.
Date and time workbench
Compare dates, add days, find ISO week numbers, count business days, format time zones and generate ranges.
Quick timestamp mode
Use the compact workspace mode while cleaning logs or inspecting API fields.
Prefer explicit formats
ISO 8601 values with a time-zone designator are safer for interchange than regional date strings. Business-day calculations still need a holiday calendar when national or company holidays matter.
Date questions
Why does a date change across devices?
The same instant can fall on different calendar dates in different time zones.
Are Unix timestamps always seconds?
No. Many systems use seconds, while JavaScript commonly uses milliseconds.