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datetime.openverbs.com · datetime.openverbs.com
Convert a proleptic-Gregorian calendar date to its Julian Day Number (the integer count of days since JDN 0, 1 January 4713 BC in the proleptic Julian calendar).
https://datetime.openverbs.com/v1/add
Add an ISO 8601 duration to a start date or date-time and return the resulting UTC instant. Calendar-aware: months and years honor month lengths (e.g. Jan 31 + P1M clamps to the last day of February). A negative-signed duration subtracts.
https://datetime.openverbs.com/v1/between
Compute the calendar breakdown (years, months, days, hours, minutes, seconds) between two ISO 8601 dates/date-times, plus exact totalSeconds. If end precedes start the result is flagged negative rather than erroring.
https://datetime.openverbs.com/v1/business-days
Add/subtract business days to a date, or count business days between two dates — skipping weekends and optional holidays.
https://datetime.openverbs.com/v1/convert
Convert an ISO datetime into another timezone, with offset, weekday and Unix time.
https://datetime.openverbs.com/v1/day-of-year
Return the ordinal day of the year (1..366), the number of days in that year and whether it is a leap year.
https://datetime.openverbs.com/v1/easter
Compute the date of Western (Gregorian) Easter Sunday for a year in 1583..9999 using the Anonymous Gregorian computus.
https://datetime.openverbs.com/v1/format
Assemble an ISO 8601 duration string from individual components (years, months, weeks, days, hours, minutes, seconds) and an optional sign. All components must be non-negative and at least one must be non-zero.
https://datetime.openverbs.com/v1/from-jdn
Convert a Julian Day Number back to a proleptic-Gregorian date, with the ISO weekday (1=Monday..7=Sunday) and its name.
https://datetime.openverbs.com/v1/humanize
Render an ISO 8601 duration as an English phrase, e.g. 'P1Y2M' → '1 year and 2 months'. Components are shown in descending order with correct pluralization.
https://datetime.openverbs.com/v1/iso-week
Return the ISO-8601 week-numbering year, week number (1..53) and weekday (1=Monday..7=Sunday) for a Gregorian date. The ISO year can differ from the calendar year around New Year.
https://datetime.openverbs.com/v1/parse
Parse an ISO 8601 duration such as 'P1Y2M10DT2H30M' into its components. Returns a normalized ISO string and totalSeconds — but totalSeconds is null when the duration contains years or months, because those are calendar-variable (use /v1/add or /v1/between for exact date math).
https://datetime.openverbs.com/v1/to-jdn
Convert a proleptic-Gregorian calendar date to its Julian Day Number (the integer count of days since JDN 0, 1 January 4713 BC in the proleptic Julian calendar).
https://datetime.openverbs.com/v1/weekday
Return the ISO weekday (1=Monday..7=Sunday) and its name for a Gregorian date.
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