VerCalc
Time & Date
Date Calculator

Add Days to DateDate & Days Calculator (Calendar + Business Days)

Add days to a date, subtract days, or calculate days between two dates (calendar or business days). Fast, accurate (leap years included), and 100% free.

Duration

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⚡ Quick Calculations

Calculator inputs stay on your device (local processing).
1

How Date Calculation Works

Our calculator uses the standard Gregorian calendar system. In 'Business Days' mode, it automatically skips Saturdays and Sundays, giving you the true working duration. For 'Days Between', we calculate the exclusive difference (time elapsed) between two dates.
2

Methodology

Calculations account for leap years (where February has 29 days). Business day calculations iterate through the date range, incrementing checks only for weekdays (Mon-Fri).

Definitions

Gregorian Calendar

The internationally accepted civil calendar.

Business Day

Any day from Monday through Friday, excluding weekends.

Mastering Date Calculations

From planning project deadlines and notice periods to counting the exact days until your next vacation. This tool handles the complexities of the Gregorian calendar, including leap years and varying month lengths, so you don't have to.

Examples

Common date calculations and their results:

Start DateOperationResult (Calendar)Result (Business)
Friday+1 DaySaturdayMonday
Friday+3 DaysMondayWednesday
Jan 1to Jan 3130 Days20-22 Days (varies)

Calendar vs. Business Days

Most calculations need to account for weekends. Toggle 'Exclude Weekends' to calculate strict Business Days (Monday-Friday). This is essential for work deadlines, shipping estimates, and legal notice periods.

Inclusive vs. Exclusive

By default, 'Days Between' calculates the duration *elapsed* (Exclusive). If you need to include the start date in the count (e.g., for day-rate billing), simply add 1 to the final result.

Mastering Date Calculations

From planning project deadlines and notice periods to counting the exact days until your next vacation. This tool handles the complexities of the Gregorian calendar, including leap years and varying month lengths, so you don't have to.

Calendar vs. Business Days

Most calculations need to account for weekends. Toggle 'Exclude Weekends' to calculate strict Business Days (Monday-Friday). This is essential for work deadlines, shipping estimates, and legal notice periods.

Inclusive vs. Exclusive

By default, 'Days Between' calculates the duration *elapsed* (Exclusive). If you need to include the start date in the count (e.g., for day-rate billing), simply add 1 to the final result.

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