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About this tool
Generate calendar version numbers like YYYY.MM.MICRO from any date and scheme, with a preview timeline of future releases.
This generator turns a release date into a Calendar Versioning (CalVer) number using the token scheme defined at calver.org — YYYY, YY, 0Y, MM, 0M, WW, 0W, DD, 0D plus MINOR, MICRO and MODIFIER — so YYYY.MM.MICRO on a July 2026 release yields 2026.7.0. It is built for release managers choosing or applying a date-based scheme, and previews what the next six monthly releases will be numbered. Presets cover well-known schemes such as Ubuntu's YY.0M (24.04 = April 2024) and JetBrains' YYYY.MINOR.
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Handles padded and unpadded year, month, week and day tokens plus MINOR, MICRO and MODIFIER.
Shows the version each of the next six monthly releases would receive, rolling year boundaries correctly.
Rejects impossible dates like 30 February and handles leap years when counting days and weeks.
CalVer (Calendar Versioning) encodes the release date into the version number — Ubuntu 24.04 means April 2024 — while SemVer encodes API compatibility (major.minor.patch). CalVer suits time-based release trains and products without a programmatic API; SemVer suits libraries whose consumers need to know whether an upgrade can break them.
YY is the short year: the full year minus 2000, without padding, so 2026 becomes 26 and 2106 becomes 106. 0Y is the same value zero-padded to two digits (06 for 2006). The month tokens work the same way: MM is unpadded (4) and 0M is padded (04), which is why Ubuntu's April 2024 release is 24.04.
MICRO is a plain counter for releases within the same date period — the third fix released in July 2026 under YYYY.MM.MICRO is 2026.7.2 — and it conventionally resets to 0 when the date segment rolls over. MODIFIER is an optional trailing tag such as beta1 or rc2 for pre-releases.
Ubuntu (YY.0M, e.g. 24.04), JetBrains IDEs (YYYY.MINOR, e.g. 2026.1), and Python's pip and pytz have used CalVer-style schemes. It is popular for operating systems, SaaS platforms and data products where 'how old is this?' matters more than 'is this API-compatible?'.