Days in month
ClientCalendar length including leap-year February.
About Days in month
Return day count for YYYY-MM. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.
How to use this page
Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.
28 days
Nearby workflows on Toolcore
- Leap year checker — Test whether a calendar year is a leap year—Gregorian rules, computed locally. when the same instant should appear as epoch, zone, or cron.
- Day of year (1–366) — Ordinal day number within the calendar year. when the same instant should appear as epoch, zone, or cron.
- Unix timestamp converter — Epoch to date: seconds, milliseconds, ISO-8601, UTC and local time—in browser. when the same instant should appear as epoch, zone, or cron.
- Date difference — Calendar days between two dates—pair with the timestamp or unit tools as needed. when the same instant should appear as epoch, zone, or cron.
Common use cases
- Days in month for quick local checks without uploading data.
- Copy results into tickets, docs, or classroom notes.
Common mistakes to avoid
Unexpected input shape
See the intro and how-to notes for accepted formats.
FAQ
Is processing local?
Yes—this runs entirely in your browser.
Agent prefill?
Use q or qb for the main text field when supported.
More tools
Related utilities you can open in another tab—mostly client-side.
Leap year checker
ClientTest whether a calendar year is a leap year—Gregorian rules, computed locally.
Day of year (1–366)
ClientOrdinal day number within the calendar year.
Unix timestamp converter
ClientEpoch to date: seconds, milliseconds, ISO-8601, UTC and local time—in browser.
Date difference
ClientCalendar days between two dates—pair with the timestamp or unit tools as needed.