About Date Calculator

Three date operations in one tool: add/subtract time from a date, calculate the exact difference between two dates, and count or add business days (excluding weekends). Supports years, months, weeks, days, hours, and minutes as units.

• Add/Subtract mode: offset a date by a specified number of years, months, weeks, days, hours, or minutes
• Difference mode: calculates years + months + days breakdown plus total days, hours, and minutes
• Business Days mode: count weekday-only days between two dates, or add N business days to find the end date
• Results show full date formatting with day-of-year and week-of-year
• Quick date presets: Tomorrow, Next Week, Next Month

Frequently Asked Questions

Does the business days calculation account for holidays?

No. It excludes Saturdays and Sundays only. Public holidays are country-specific and not factored in. For precise business day calculations involving holidays, you’d need a holiday calendar for your region.

How does month addition handle edge cases like January 31 + 1 month?

JavaScript’s Date object handles overflow by rolling forward. January 31 + 1 month becomes March 3 (or March 2 in leap years), because February doesn’t have 31 days. This matches the behavior of most programming languages.