45-day pre-close checklist
- Jun 30, 2025 − 45 days = May 16, 2025
time calculator
Subtract Days from Date Calculator
Work backward from any due date by subtracting a set number of days to see when prep work must begin.
Results
- Result year
- 2025.00
- Result month
- 5.00
- Result day
- 16.00
How to use this calculator
- Enter the target date (year, month, day).
- Enter the number of days to subtract; use a negative number if you want to move forward instead.
- Read the resulting earlier date in year, month, and day fields.
Inputs explained
- Target date
- The date you need to count backward from.
- Days to subtract
- Positive to move backward; enter a negative number to move forward instead.
How it works
We convert the target date into a Date object, subtract the requested number of days, and return the resulting year/month/day.
Behind the scenes the Date API handles month lengths and leap years for accurate results every time.
Formula
Result date = Target date − N days
When to use it
- Working back from due dates to schedule drafts, reviews, or deposits.
- Finding cutoffs for cancellation periods or refund windows.
- Counting back to start medications, training blocks, or travel prep.
Tips & cautions
- Use negative numbers if you need to shift forward instead of backward.
- For workdays only, switch to the Business Days calculator.
- Pair with timezone planning if team members are distributed—results assume local time.
- Counts calendar days; does not skip weekends or holidays.
- Uses the Gregorian calendar only.
- No time-of-day support—dates are returned without timestamps.
Worked examples
Count back 10 days from an event
- Sep 14 − 10 days = Sep 4
Deep dive
This subtract-days calculator counts backward from any date. Enter the target date and days to subtract to see the earlier landing date—great for prework schedules and cutoff windows.
Leap years and month ends are handled automatically. It counts calendar days only; use the business-day calculator to skip weekends and holidays.
FAQs
- Does it respect leap years and varying month lengths?
- Yes. JavaScript’s Date engine manages month boundaries so February 29 and 30-day months are handled automatically.
- What if I need business days instead of calendar days?
- Use the business days calculator if you only want Monday–Friday counted. This tool works with every day of the week.
- Can I add days instead?
- Yes. Enter a negative number (e.g., −5) to move forward instead of backward.
- Does it skip weekends or holidays?
- No. It counts calendar days. Switch to the business-days tool to exclude weekends and holidays.
- Does time zone matter?
- Dates use local time from the browser/host. If you’re coordinating across time zones, align everything to UTC first.
Related calculators
Outputs are based on the Gregorian calendar without holiday awareness. Double-check against your own schedule if holidays matter.