Dates & Time

45 Days From Date Calculator

Find the date 45 days before or after a start date. Count calendar days or business days, useful for NET 45 invoices and 1031 exchange deadlines.

How to use
  1. Pick your start date.
  2. Choose forward or backward 45 days.
  3. Switch to business days to skip weekends.
Days
Resulting date

pick a start date

Weekday
In weeks
Approx months
Date math uses your inputs as given; check time-zone and leap-year edge cases.
Was this helpful?

How it's calculated

target date = start date ± N days

N = number of days; + counts forward (days out), − counts backward (days ago). Calendar mode counts every day; workday mode counts only Mon–Fri.

Common questions

What is the 45-day rule in a 1031 exchange?

After selling a property, you have 45 calendar days to formally identify replacement properties. This tool finds that deadline.

When does a NET 45 invoice come due?

45 days after the invoice date. Enter the invoice date and count forward 45 calendar days.