How to calculate dates fast
- Use “days between” for durations and deadlines.
- Use “business days” for working-day schedules.
- Use “time zones” to compare meeting times across regions.
Recommended (top 3)
Start here for most date/time questions.
Calculators
- Date Difference Calculator (days, business days, Y/M/D) | CalcBE
Compute days between dates, count business days and working hours, and see a year‑month‑day breakdown. Optionally include the start date and copy a shareable result URL.
- Business Days & Countdown Calculator | Skip Weekends | CalcBE
Count calendar or business days between two dates, exclude custom weekend patterns and holiday lists, and jump forward or backward by N business days. Copy a shareable URL for the full setup.
- Time duration adder & subtractor (HH:MM/HH:MM:SS) | CalcBE
Add or subtract multiple HH:MM or HH:MM:SS durations line by line and get a normalized total time. Supports leading +/-, negative totals, spans over 24 hours, and shareable result URLs—runs locally in your browser.
- Time zone converter – instant world clock with multiple cities and offsets | CalcBE
Enter a date and time to convert between time zones, with automatic daylight‑saving shifts, presets for major cities, and a shareable result link.
- ISO week number, quarter & fiscal year calculator | CalcBE
Get ISO week number, calendar/fiscal quarter, and fiscal year for any date. Customize week rules and fiscal year start month — no sign-in.