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Plan ahead and track time with precision.
Date and time calculators for every planning need — age, date difference, days-until, business-day calculator, time zone converter, world clock, time duration, and Hijri-Gregorian conversion. Whether you're planning a project deadline, calculating someone's exact age in years/months/days, or coordinating a meeting across multiple time zones — these tools give you precise answers instantly.
Built around the standard Gregorian and Hijri (Islamic lunar) calendars with full leap-year handling, business-day awareness, and DST-aware time-zone math. No external API calls — everything runs locally in your browser.
Bidirectional Islamic ↔ Western calendar conversion, accurate from 622 CE onwards.
Time zone calculations correctly handle daylight saving transitions for every IANA zone.
Add/subtract working days while skipping weekends — perfect for project deadlines and SLAs.
Exactly. It tracks the actual day-of-year and gives you age in years, months, and days down to the precise day count — leap years and varying month lengths handled correctly.
Yes — the Add/Subtract Days calculator has a 'business days only' mode that skips Saturdays and Sundays automatically.
It uses the tabular Islamic calendar (Umm al-Qura standard), accurate to ±1 day vs visible-moon-sighting locally. For exact ritual dates (Eid, Hajj), confirm with your local mosque or moon-sighting committee.
Yes. Tools use the browser's IANA time-zone database which knows the historical and future DST rules for every zone — so a March meeting between London and New York shows the correct hour shift.
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Need something specific? Search all 159 tools →
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