Calculators

Day Count Calculator

Handles the date math behind compliance deadlines: add or subtract a number of days from a start date (with 45, 90, 120, and 180-day presets), or count the calendar days between any two dates. Results update instantly as you type.

Step by step

1. Choose a mode

   Use the tabs to pick Add or Subtract Days (the default) or Days Between Dates.
2. Set the start date

   The Start Date defaults to today; type a date or pick one from the calendar.
3. Choose the direction

   Select After to count forward from the start date or Before to count backward.
4. Pick the day count

   Click a preset chip (45, 90, 120, or 180 days) or type any count from 1 to 3650 in the Custom field.
5. Read the result

   The resulting date appears instantly in the result card, with a caption restating the count and direction.
6. Count between dates

   In Days Between Dates mode, pick any two dates to see how many calendar days separate them; the order of the dates does not matter.

What you get

Add/subtract mode shows the resulting date with its weekday (for example, "Friday, December 12, 2025") and a caption such as "120 days after August 15, 2025". Between mode shows the day count and a caption identifying which date is later. Results are on-screen only; there is no export. An in-page How to Use modal and an About Day Counting section explain the common LIHTC windows.

Tips & notes

• For the 120-day verification window: enter the certification effective date, choose 120 and Before for the earliest acceptable document date; or enter the document date, choose 120 and After for the last effective date it supports.
• All counts use calendar days, including weekends and holidays, and the start date is day zero (one day after January 1 is January 2).
• Typing in the Custom field overrides the preset chips; clicking a chip clears the Custom field.
• Counting conventions can differ by program and agency; confirm the applicable rule with your state agency or investor before relying on a computed deadline.