Find the weekday, ordinal day, remaining days, quarter, and leap/common year type for an exact Gregorian date without time-zone date shifting.
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Inspect the weekday, ordinal day, remaining days, quarter and year type for one preserved Gregorian date without a UTC-to-local one-day shift.
Know the weekday for the exact date written in a record.
Enter the ISO date and reconcile the returned ISO/long date before using the weekday.
The output repeats the same date fields and the correct weekday.
Verify day-of-year and remaining-day position around leap years.
Test dates before, on and after February 29 and inspect year type.
Ordinal counts follow the Gregorian leap rule without a local-zone shift.
Prevent 2026-07-17 from becoming 2026-07-16 Thursday.
Run the authored Friday example and inspect exact date, weekday and day 198.
Gets Friday for the entered July 17 date with no contradictory interpretation.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Apply the full Gregorian 4/100/400 leap-year rule to a bounded whole year and see its century exception, February length, and total days.
Calculate a strict calendar difference, elapsed days, inclusive dates, completed months, and Mon–Fri dates without DST off-by-one errors.
The input is parsed as exact Gregorian year, month, and day fields. Impossible dates and values outside 1600-01-01 through 9999-12-31 are rejected.
The validated calendar fields are placed on a whole-day axis for weekday and ordinal arithmetic; local time getters are never mixed with UTC parsing.
Weekday = Gregorian serial day modulo sevenDay-of-year and remaining-day counts use the Gregorian 4/100/400 leap-year rule. Quarter is a calendar grouping, not a fiscal-calendar inference.
Updated: August 2026
A coordinator checks an exact milestone date, verifies the repeated ISO date, and records its weekday without treating it as a workday.
An analyst checks February 29 and a later date to confirm the expected ordinal-day shift in a leap year.
A New York user enters 2026-07-17 and confirms the result remains Friday, July 17 rather than shifting to Thursday, July 16.
Preserve the entered calendar fields and use one UTC-stable whole-day basis for all weekday and ordinal calculations.
Check work schedules, holidays, fiscal conventions, and the source calendar or adoption context separately.
Inspect one exact YYYY-MM-DD Gregorian date. The engine repeats the preserved ISO date alongside its weekday and ordinal position so a local UTC offset cannot silently move the record to the previous day.