- For date difference: Select your start and end dates
- Choose whether to include the end date in the count
- Optionally exclude weekends for business days calculation
- Click 'Calculate' to see the difference in days, weeks, months, and years
- For date arithmetic: Enter a base date and number of days to add or subtract
- View the resulting date and day of the week
How is the date difference calculated?
The calculator counts the number of calendar days between the start and end dates. By default, it excludes the end date from the count. You can toggle 'Include End Date' to include it in the calculation.
What are business days?
Business days typically refer to weekdays (Monday through Friday), excluding weekends. When you select 'Exclude Weekends', the calculator will only count Monday through Friday.
Can I calculate dates in the past?
Yes! You can use the date arithmetic feature to subtract days from any date to find a past date. Simply select 'Subtract Days' and enter the number of days.
Does this calculator account for leap years?
Yes, the calculator automatically accounts for leap years when calculating date differences and performing date arithmetic.
Calculator Tools Complete Guide【2026】- Essential Online Calculators for Everyday Life
Master essential online calculators for everyday calculations. From percentage and age calculators to financial tools like compound interest and loan calculators, health calculators including BMI and body fat, to educational tools like GPA and fraction calculators. All free, accurate, and privacy-focused.
World Clock and Timezone Complete Guide: Timezone Principles, DST, and Programming Implementation
Deep dive into timezone principles including UTC, GMT, timezone offsets, daylight saving time handling, with code implementations in multiple programming languages.