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

# Time 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
[
Is It Leap Year is-it-leap-year
Check whether a Gregorian calendar year is a leap year.
1cr · v2026-04-22
](/tools/is-it-leap-year/)
Countdown
[
Countdown Timer countdown-timer
Calculate an exact countdown between two ISO datetimes.
1cr · v2026-04-22
](/tools/countdown-timer/)
Date Format
[
Date to Roman Numerals Converter date-to-roman-numerals-converter
Convert a calendar date into Roman numeral date formats.
1cr · v2026-04-22
](/tools/date-to-roman-numerals-converter/)
Dates
[
Halfway Date Calculator halfway-date-calculator
Find the midpoint and quarter points between two dates.
1cr · v2026-04-22
](/tools/halfway-date-calculator/)
Duration
[
Hours Calculator hours-calculator
Calculate gross and net hours between two times, including breaks.
1cr · v2026-04-22
](/tools/hours-calculator/)
API OPERATIONAL v1 · OpenAPI 3.1 · MCP 2025-06-18
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