> For the complete documentation index, see [llms.txt](/llms.txt).
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- time-date
21 endpoints

# Time-Date API

Same bearer token, same credit pool, same JSON envelope as every other endpoint — drop them into apps, sites, workflows, or agents without rebuilding formulas, validation, or docs.
[Start free →](/billing/checkout/?plan=free) [View OpenAPI](/v1/docs) [All categories](/tools/)
Calendar
[
Hebrew Calendar Converter hebrew-calendar-converter
Convert between Gregorian and Hebrew dates, including leap months, year kind and month lengths.
1cr · v2026-04-22
](/tools/hebrew-calendar-converter/) [
Hijri Calendar Converter hijri-calendar-converter
Convert between Gregorian and Hijri (Islamic) dates with month names, sacred-month and leap-year flags.
1cr · v2026-04-22
](/tools/hijri-calendar-converter/) [
When Is Leap Year when-is-leap-year
Check leap-year status and nearby leap years using Gregorian rules.
1cr · v2026-04-22
](/tools/when-is-leap-year/)
Calendars
[
Leap Years List leap-years-list
List every leap year in a range using the Gregorian rule.
1cr · v2026-04-22
](/tools/leap-years-list/)
Date Tools
[
Add Business Days to Date add-business-days-to-date
Add or subtract business days from a date, skipping weekends under a configurable workweek pattern.
1cr · v2026-04-22
](/tools/add-business-days-to-date/) [
Age Calculator age-calculator
Exact age in years/months/days plus total days, next-birthday countdown, day born, and zodiac sign.
1cr · v2026-04-22
](/tools/age-calculator/) [
Date Calculator date-calculator
Add or subtract years, months, weeks, and days from a date.
1cr · v2026-04-22
](/tools/date-calculator/) [
Date Difference Calculator date-difference-calculator
Calculate days, weeks, approximate months/years, and business days between two dates.
1cr · v2026-04-22
](/tools/date-difference-calculator/) [
Day of the Year Calculator day-of-the-year-calculator
Day number within the year plus days remaining, year progress, quarter, and ISO week.
1cr · v2026-04-22
](/tools/day-of-the-year-calculator/) [
Days in Month days-in-month
Number of days in a given month/year with leap-year detection and calendar boundary details.
1cr · v2026-04-22
](/tools/days-in-month/) [
Julian Date Converter julian-date-converter
Convert between calendar dates and Julian Date, Modified Julian Date, or Unix time.
1cr · v2026-04-22
](/tools/julian-date-converter/) [
Time Between Two Dates time-between-two-dates
Calculate exact elapsed time between two ISO datetimes.
1cr · v2026-04-22
](/tools/time-between-two-dates/) [
Week Number Calculator week-number-calculator
ISO 8601 and North American week numbers for a date, with week ranges, or the dates of a given ISO week.
1cr · v2026-04-22
](/tools/week-number-calculator/)
Differences
[
How Long Ago Calculator how-long-ago-calculator
Express the gap between a date and today in years, months, weeks and days.
1cr · v2026-04-22
](/tools/how-long-ago-calculator/)
Season
[
Winter Solstice Day winter-solstice-day
Return winter solstice date/time for Northern or Southern Hemisphere, 2024-2030.
1cr · v2026-04-22
](/tools/winter-solstice-day/)
Time Calculators
[
Time Duration Calculator time-duration-calculator
Calculate elapsed time between two times or datetimes.
1cr · v2026-04-22
](/tools/time-duration-calculator/) [
Time to Decimal Converter time-to-decimal-converter
Convert between hours/minutes/seconds and decimal hours.
1cr · v2026-04-22
](/tools/time-to-decimal-converter/) [
Work Hours Calculator work-hours-calculator
Calculate weekly work hours, overtime, and optional pay from day entries.
1cr · v2026-04-22
](/tools/work-hours-calculator/)
Time Conversion
[
Military Time Converter military-time-converter
Convert between 12-hour, 24-hour, and military time, including the spoken military form.
1cr · v2026-04-22
](/tools/military-time-converter/) [
Time Zone Converter time-zone-converter
Convert a local date/time between IANA time zones with DST-aware offsets, to one or more targets.
1cr · v2026-04-22
](/tools/time-zone-converter/) [
Unix Time Converter unix-time-converter
Convert between Unix timestamps and UTC ISO datetimes.
1cr · v2026-04-22
](/tools/unix-time-converter/)
API OPERATIONAL v1 · OpenAPI 3.1 · MCP 2025-06-18
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