Dates to Day Names
Paste one YYYY-MM-DD date per line to get its weekday without time-zone shifts.
A QUICK WALKTHROUGH
How to use this tool
- Enter one strict ISO date per line.
- Choose Convert dates.
- Review each weekday or the exact line reported as invalid.
Strict ISO validation
Only four-digit-year YYYY-MM-DD lines are accepted, including leap-year checks. Blank lines are skipped.
Stable date-only semantics
Dates are constructed and formatted at UTC midnight, avoiding local time-zone shifts and daylight-saving changes.
Private batch conversion
Conversion happens in your browser. Invalid input identifies its original line and hides stale results.
GOOD TO KNOW
Common questions
Can I convert multiple dates?
Yes. Enter one date per line; every valid line is returned with its original line number.
Are dates interpreted in my time zone?
No. Date-only values use UTC calendar semantics, independent of the device time zone.
What happens on an invalid line?
The result is withheld and the exact non-empty input line is reported.