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Date Calculator

Calculate dates by adding or subtracting days, weeks, months, and years. Find date differences, business days, weekdays, and plan future dates with our comprehensive date calculator.

Start Calculating

Add or Subtract Time from Date

Quick Options

+1 Day
+1 Week
+30 Days
+90 Days

Result Date

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Calculate Date Difference

Date Difference

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Business Days Calculator

Business Days

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Day of Week Calculator

Day Information

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How to Use the Date Calculator

1

Choose Function

Select the type of date calculation you need from the tabs above.

2

Enter Dates

Input the required dates using the date picker fields.

3

Set Parameters

Choose time units to add/subtract or additional options as needed.

4

Get Results

View calculated dates with detailed information and breakdowns.

Frequently Asked Questions

How does the date calculator handle leap years?
The date calculator automatically accounts for leap years when performing calculations. Leap years occur every 4 years (except century years unless divisible by 400), and the calculator adjusts for February 29th accordingly.
What are business days and how are they calculated?
Business days are weekdays (Monday through Friday) excluding weekends. Our business day calculator counts only these days and can optionally exclude weekends. Note that it doesn't account for holidays, which may vary by country or organization.
Can I add or subtract different time units together?
Yes! You can combine years, months, weeks, and days in a single calculation. For example, you can add 1 year, 3 months, 2 weeks, and 5 days to a date all at once.
How accurate is the date difference calculation?
The date difference calculation is precise and accounts for varying month lengths, leap years, and exact calendar dates. Results show years, months, days, and total days for comprehensive information.
What happens when I subtract more time than available?
When subtracting time that would result in a date before the start date, the calculator will show a date in the past. This can be useful for historical calculations or determining earlier dates.
Can I use this calculator for project planning?
Absolutely! The date calculator is perfect for project planning. Use it to calculate project deadlines, milestones, business day durations, and delivery dates. The business days calculator is especially useful for work-related planning.
Does the calculator work with dates far in the past or future?
Yes, the calculator can handle a wide range of dates from far in the past to far in the future. However, very distant dates may have limitations based on browser capabilities and calendar system accuracy.
How do I calculate age using the date calculator?
Use the Date Difference calculator with your birth date as the "From Date" and today's date (or any specific date) as the "To Date". This will show your exact age in years, months, and days.
Can I calculate working days excluding holidays?
The business days calculator excludes weekends but not specific holidays, as these vary by country and organization. For holiday-specific calculations, you would need to manually account for those days.
What time zone does the calculator use?
The calculator uses your local time zone as set on your device. Date calculations are performed at the beginning of each day (midnight), so time zone differences typically don't affect date-only calculations.

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