Date Tools
Browse all available date tools.
Available tools
- Age Calculator Compute completed years, months, and days between a birth date and a reference date.
- Business Days Between Count weekdays in a half-open date range, optionally subtracting supplied holidays.
- Business Days Between Dates Calculator Count weekdays Monday through Friday in an inclusive date range, optionally subtracting supplied holidays.
- Calendar Anniversary February Policy Flag Tool Compute calendar anniversary february policy flag from explicit bounded inputs.
- Calendar Century Year Position Tool Compute calendar century year position from explicit bounded inputs.
- Calendar Date Component Mask Tool Encode supplied year/month/day presence as bits 4/2/1; not a date-value validator.
- Calendar Decade Explicit Origin Index Tool Calculate calendar decade explicit origin index from explicit caller-supplied inputs.
- Calendar Interval Single Month Containment Tool Calculate calendar interval single month containment from explicit caller-supplied inputs.
- Calendar Month End Subtraction Clamp Loss Tool Compute calendar month end subtraction clamp loss from explicit bounded inputs.
- Calendar Month Ordinal Serial Pair Tool Calculate calendar month ordinal serial pair from explicit caller-supplied inputs.
- Calendar Overlap and Common Gap Finder Compare bounded supplied busy calendars over an explicit half-open epoch-millisecond window, deduplicating same-calendar overlap and delegating interval cells to report common gaps, overlaps and per-calendar occupied duration.
- Calendar Quarter Day Position Tool Compute calendar quarter day position from explicit bounded inputs.
- Calendar Semi Year Period Index Tool Calculate calendar semi year period index from explicit caller-supplied inputs.
- Calendar Week Span Overlap Tool Intersect two supplied seven-day calendar spans using half-open absolute-day bounds.
- Calendar Year Zero Omission Interval Loss Tool Calculate calendar year zero omission interval loss from explicit caller-supplied inputs.
- Civil Date Year Two Digit Window Tool Compute civil date year two digit window from explicit bounded inputs.
- Civil Day Fraction Midnight Policy Convert explicit non-leap-second civil clock fields to a day fraction with an explicit 24:00 end-of-day policy.
- Civil Time Millisecond Tie Carry Tool Round a non-leap civil second to the nearest second using an explicit half-tie policy.
- Civil Time Two Offset Order Reversal Tool Calculate civil time two offset order reversal from explicit caller-supplied inputs.
- Date Add Days Calculator Add a signed whole-day offset to an ISO calendar date.
- Date Comparison Partial Precision Overlap Tool Calculate date comparison partial precision overlap from explicit caller-supplied inputs.
- Date Difference Calculator Calculate the signed number of calendar days between two ISO dates.
- Date Interval Single Day Closure Label Tool Compute date interval single day closure label from explicit bounded inputs.
- Date Range Unbounded End Token Tool Compute date range unbounded end token from explicit bounded inputs.
- Date Time End Of Day Carry Field Tool Compute date time end of day carry field from explicit bounded inputs.
- Date to Julian Day Number Converter Convert a Gregorian calendar date to its Julian Day Number.
- Date: Astronomical Noon Day Fraction Tool Distinguish Julian-day noon-based fractional phase from civil-midnight phase in the same unspecified timescale; does not convert time standards or civil dates.
- Date: Calendar Era Year Zero Policy Tool Convert an astronomical signed year with year zero into a positive BCE/CE era year, without jurisdictional calendar adoption rules.
- Date: Calendar Month Length With Leap Flag Tool Return month length from an explicit Gregorian leap-year flag and one-based month; does not infer leap status from a year.
- Date: Date Boundary Midnight Endpoint Label Tool Distinguish the interval-end spelling 24:00 from start-of-day 00:00, retaining day carry instead of silently treating both as one instant.
- Date: Date Only Timezone Annotation Tool Attach an explicit zone annotation to a validated date-only value while retaining that it does not resolve a clock time or instant; annotation is not an IANA lookup.
- Date: Date Span Touching Boundary Flag Tool Distinguish exact boundary contact from positive-length overlap between two nonempty half-open civil-date spans; no timezone or business-day interpretation.
- Date: Decimal Hour Civil Time Field Tool Convert one nonnegative decimal civil-hour value to nearest-second fields with explicit 24-hour day carry; no timezone or fractional-day astronomical convention.
- Date: ISO Date Reduced Precision Label Tool Classify strict Gregorian ISO reduced precision YYYY, YYYY-MM or YYYY-MM-DD without inventing omitted fields.
- Date: Leap Second Display Second Token Tool Inspect a two-digit seconds token with leap-second60 accepted only when the caller explicitly verifies date/time-scale context; no fabricated leap history.
- Date: Ordinal Date Field Split Tool Parse a strict Gregorian YYYY-DDD ordinal-date field and validate its leap-aware day-of-year domain.
- Date: Signed Day Offset Label Tool Label a resolved signed calendar-day offset and retain its magnitude without implying business-day or timezone rules.
- Date: Timestamp Fractional Second Digit Count Tool Count lexical fractional-second digits in one strict HH:MM:SS[.digits][Z] token, retaining trailing zeros without timestamp conversion.
- Date: Timestamp Offset Negative Zero Check Tool Distinguish RFC3339 unknown-local-offset -00:00 from known zero offset Z/+00:00 in one validated offset token.
- Date: Timestamp Zone Bracket Token Tool Extract one conservative bracketed timestamp timezone annotation token; grammar validity does not establish IANA membership or resolve an instant.
- Date: Utc Offset Minute Component Check Tool Parse a restricted signed HH:MM UTC offset with minute validation and explicit -00:00 unknown-local-offset evidence; no timezone database.
- Date: Weekday Mask Bitset Label Tool Decode a seven-bit weekday mask with Monday as bit zero, returning ordered labels and no scheduling assumptions.
- Date: Weekmask First Working Day Offset Tool Find the first included working weekday on or after a supplied Monday-zero weekday under a seven-bit mask; no holiday calendar or elapsed-hour assumptions.
- Datetime Minute Rounding Day Carry Tool Calculate datetime minute rounding day carry from explicit caller-supplied inputs.
- Day Fraction Midnight Wrap Tool Wrap explicitly supplied elapsed-day fractions at integer midnight boundaries, without time zones or leap seconds.
- Day of Year Calculator Calculate the one-based ordinal day of an ISO calendar date.
- Days in Month Calculator Return the number of days in a Gregorian calendar month.
- Days in Quarter Calculator Return the number of calendar days in the Gregorian quarter containing an ISO date.
- Elapsed Duration Sign Canonicalization Tool Calculate elapsed duration sign canonicalization from explicit caller-supplied inputs.
- End of Month Tool Return the last day of the month of an ISO calendar date.
- End Of Month Unknown Day Mask Format an explicit year and month with an unknown-day mask or validated supplied day, without imputing month end.
- Era Boundary Day Gap Tool Compare an ISO civil date with an explicit era-boundary date without selecting a historical era.
- Fiscal Period Label Explicit Start Month Tool Compute fiscal period label explicit start month from explicit bounded inputs.
- Fiscal Quarter Calculator Return the fiscal quarter (1-4) of an ISO calendar date for a fiscal year that starts in a chosen month.
- Fiscal Week Closure Policy Token Tool Compare supplied positions in the same numbered boundary week and retain the supplied ownership policy.
- Fiscal Week Extra Day Remainder Tool Calculate fiscal week extra day remainder from explicit caller-supplied inputs.
- Hour 24 Endpoint Normalization Tool Calculate hour 24 endpoint normalization from explicit caller-supplied inputs.
- Is Future Checker Check whether an ISO 8601 date or date-time falls after the UTC day of a reference date-time.
- Is Leap Day Checker Check whether an ISO calendar date is February 29 of a leap year.
- Is Past Checker Check whether an ISO 8601 date or date-time falls before the UTC day of a reference date-time.
- Is Today Checker Check whether an ISO 8601 date or date-time falls on the same UTC day as a reference date-time.
- Is Weekend Checker Check whether an ISO calendar date falls on a Saturday or Sunday.
- ISO 8601 Unknown Component Mask Tool Compute iso 8601 unknown component mask from explicit bounded inputs.
- ISO Duration Fractional Component Token Tool Compute iso duration fractional component token from explicit bounded inputs.
- ISO Duration Week Only Token Tool Compute iso duration week only token from explicit bounded inputs.
- ISO Week Date Field Formatter Format explicit ISO week-date fields, validating the year-specific existence of week 53 without deriving the fields from a date.
- ISO Week Number Return the ISO-8601 week number and week year for a calendar date.
- ISO Week Number Calculator Determine the ISO-8601 week number and ISO week year of a calendar date.
- ISO Week Year Calculator Return the ISO-8601 week-numbering year that owns the week of an ISO calendar date.
- ISO Weekday Calculator Return ISO weekday number and English name for an ISO calendar date.
- ISO Weekday Cycle Offset Tool Calculate iso weekday cycle offset from explicit caller-supplied inputs.
- ISO Weekday Sunday Zero Crosswalk Tool Compute iso weekday sunday zero crosswalk from explicit bounded inputs.
- Julian Day Number to Date Converter Convert a Julian Day Number back to a Gregorian calendar date.
- Leap Year Checker Check whether a Gregorian calendar year is a leap year.
- Local Date Fixed Offset Preimage Tool Calculate local date fixed offset preimage from explicit caller-supplied inputs.
- Minute Precision Interval Envelope Tool Calculate minute precision interval envelope from explicit caller-supplied inputs.
- Month Index Relative Origin Tool Compare supplied astronomical year/month indices with exact integer arithmetic, without day/calendar-duration conversion.
- Month Span Endpoint Inclusion Budget Tool Calculate month span endpoint inclusion budget from explicit caller-supplied inputs.
- Next Weekday Finder Find the first date after an ISO calendar date that falls on a target ISO weekday.
- Ordinal Day Leap Boundary Crosswalk Tool Compute ordinal day leap boundary crosswalk from explicit bounded inputs.
- Proleptic Year Signed Padding Tool Calculate proleptic year signed padding from explicit caller-supplied inputs.
- Quarter of Year Calculator Return the calendar quarter (1-4) of an ISO calendar date.
- Recurrence Rule Calculator Generate recurring dates from a start date with daily/weekly/monthly/yearly frequency and interval; monthly and yearly steps clamp to the last valid day of the target month.
- Relative Date Anchor Literal Formatter Tool Compute relative date anchor literal formatter from explicit bounded inputs.
- Start of Month Tool Return the first day of the month of an ISO calendar date.
- Timestamp Fraction Rightpad Without Rounding Tool Compute timestamp fraction rightpad without rounding from explicit bounded inputs.
- Timestamp Fraction Rounding Second Carry Tool Compute timestamp fraction rounding second carry from explicit bounded inputs.
- Timestamp Offset Second Component Token Tool Compute timestamp offset second component token from explicit bounded inputs.
- Timestamp Subsecond Tick Divisibility Tool Calculate timestamp subsecond tick divisibility from explicit caller-supplied inputs.
- Timezone Offset Sign Hour Minute Pair Tool Compute timezone offset sign hour minute pair from explicit bounded inputs.
- UTC Offset Colon Style Normalizer Tool Compute utc offset colon style normalizer from explicit bounded inputs.
- Weekday Occurrence Remaining In Month Tool Compute weekday occurrence remaining in month from explicit bounded inputs.
- Weekday Periodic Step Reachability Tool Calculate weekday periodic step reachability from explicit caller-supplied inputs.
- Weeks in Year Calculator Return the number of ISO-8601 weeks in a year, given an ISO year or an ISO date.
- Year Calendar Generate a Monday-first calendar for all 12 months and mark the ISO week containing an optional date. Dates are interpreted in UTC to avoid local time-zone shifts.
- Zodiac Sign Calculator Return the western zodiac sign for a calendar month and day using standard date ranges.