Date Calculator
Compute calendar / business-day / total-day differences between dates, add or subtract by year/month/week/day, and look up week number, quarter, and Julian day.
Date Difference
Date Add / Subtract
Date Info
What does Date Calculator do?
Compute calendar / business-day / total-day differences between dates, add or subtract by year/month/week/day, and look up week number, quarter, and Julian day.
Interpreting results and common questions
Does a weekday calculation include local holidays?
Use the tool’s stated rules, not an assumed official work calendar. Check holidays, exceptional workdays and whether endpoints are included before scheduling.
References and result limitations
Local results depend on the input and selected options. Retain the input example, format and processing rules when citing a result, and verify the output. Keep keys and other sensitive material out of public examples.
These references explain protocol or format rules; they do not endorse results produced by this site.