Reference hub
Date Calculator
Add or subtract calendar days, weeks, months, and business days with clear counting assumptions.
Date Time Encyclopedia answer, with calculation details and assumptions below.
Choose one of the focused calculators below. Each page gives a direct answer first, then shows the assumptions and related date or time lookups.
Snapshot
Date Calculator
Add or subtract calendar days, weeks, months, and business days with clear counting assumptions.
Choose one of the focused calculators below. Each page gives a direct answer first, then shows the assumptions and related date or time lookups.
- Calendar-day pages
- Days, weeks, and months from today or ago
- Business-day pages
- Weekday counts that skip Saturday and Sunday
- Evergreen pages
- Start-date URLs that stay correct over time
- Difference pages
- Entry points for days and business days between dates
Method
Hub pages group focused answer pages around a shared date, calendar, time zone, or timestamp intent.
Find Another Lookup
Choose the right date calculation
Use calendar-day pages when every day counts, business-day pages when Saturdays and Sundays should be skipped, and fixed start-date pages when the answer must stay stable after today changes.
Counting assumptions
Calendar-day answers include weekends. Business-day answers skip Saturdays and Sundays but do not remove country-specific public holidays, which keeps the rule transparent across countries.
Related Lookups
FAQ
Which date calculator should I use?
Use days or weeks for calendar-day offsets, months for same-day-of-month offsets, and business days when weekends should be excluded.
Do business-day calculators remove public holidays?
No. Business-day pages skip Saturdays and Sundays only, so official deadlines may still need local holiday checking.