About Date Calculations

Date calculations are essential for project planning, legal deadlines, and scheduling. Adding days is straightforward, but months and years require special handling due to varying month lengths and leap years.

How It Works

Days: Directly adds/subtracts 24-hour periods
Weeks: Adds/subtracts 7-day periods
Months: Preserves the day-of-month when possible (rolls over to next month if invalid)
Years: Preserves month/day when possible (adjusts for leap years)

Examples

45 business days from today = [calculated date]
6 months from January 31 = July 31
1 year from February 29, 2020 = March 1, 2021

Quick Date Converter

Days to Weeks

Weeks to Days

Result

1 week = 7 days

Frequently Asked Questions

How are month additions handled?

When adding months, we try to preserve the day of month. If the resulting month doesn't have enough days (e.g., adding 1 month to January 31), it rolls over to the next month.

What about leap years?

The calculator automatically accounts for leap years when adding/subtracting years or months that include February.

Does this handle time zones?

All calculations are performed using your browser's local time zone. For precise time zone calculations, use a dedicated time zone converter.

Disclaimer: For informational and educational purposes only. Not professional advice. Always verify critical dates with official sources or qualified professionals, especially for legal, financial, or medical deadlines.

Date Add Calculator

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Date Add Calculator Add Days Weeks Months or Years

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