Days Until/Since Date Calculator
Calculate how many days until a future date or how many days since a past date. Perfect for countdowns, planning, or tracking time passed.
This free tool lets you quickly find out exactly how many days remain until a future date or how many days have passed since a past date. Get results in days, weeks, months, and also see business days (weekdays only).
How This Tool Works
Our days calculator uses precise date calculations to determine the exact number of days between today and your target date:
- Days Until/Since: The total number of calendar days until a future date or since a past date
- Weeks and Days: The same period expressed as complete weeks plus remaining days
- Business Days: The number of weekdays (Monday through Friday), excluding weekends
- Months and Years: Approximate time in larger units for better context
The calculator automatically determines whether your target date is in the future or the past, and adjusts its calculations accordingly. It accounts for leap years and varying month lengths to ensure accuracy.
Frequently Asked Questions
How accurate is the days calculation?
The calculation is highly accurate, taking into account leap years and the varying number of days in different months. The day count is precise to the day and includes the end date in the calculation (inclusive counting).
Why would I need to calculate days until or since a date?
This calculation is useful for many purposes:
- Planning events and tracking countdowns (weddings, graduations, vacations)
- Project management and deadline tracking
- Calculating age in days
- Tracking time since significant life events
- Determining business days for shipping or contract fulfillment
- Planning milestones for events (100 days until...)
Does the business days calculation account for holidays?
No, the business days calculation only excludes weekends (Saturdays and Sundays). It does not account for holidays, which vary by country and region. For precise business day calculations including holidays, you would need to use a specialized business day calculator that includes the specific holidays for your country or region.
Tips and Best Practices
Tips for using the Days Until/Since calculator effectively:
- For project planning, focus on the business days calculation to get a more accurate sense of working time
- Use the weeks and days breakdown for better context with longer time periods
- For countdown websites or apps, the total days calculation provides the clearest metric
- When tracking time since past events (anniversaries, milestones), bookmark this page for quick reference
- For tracking milestones, calculate multiple dates (30 days, 60 days, 90 days from now) by running the calculation multiple times
- Remember that for shipping or business purposes, only the weekday count is relevant