Date calculations (DATE)

13.1Count the days between two dates#

Press 2NDDATE5. Lines are DT1 (first date), DT2 (second date), DBD (days between dates) and a choice of ACT (actual days) or 360 (twelve 30-day months). Dates are typed as month.dayyear: 1.0123 means January 1, 2023. Valid years are 1950 to 2049.

Example 13.1

Enter a date

1. Type 1.0123 and press enter. The weekday shows on the right.

   2NDDATE51.0123ENTER

Example 13.2

Days between January 1 and March 15, 2023

1. Enter both dates, then press CPT on DBD.

   2NDDATE51.0123ENTER↓3.1523ENTER↓CPT

Example 13.3

Using a 360-day year

1. Press down to the ACT line, change to 360, and compute DBD again.

   2NDDATE512.3123ENTER↓3.3124ENTER↓↓2NDSETENTER↑CPT

See also Days between two dates

13.2Find the date a number of days later#

Enter DT1, move to DBD, type the number of days and press ENTER, then go back up to DT2 and press CPT. To find an earlier date, enter DT2 and DBD and compute DT1.

Example 13.4

Thirty days after January 31, 2024

1. Enter DT1, set DBD to 30, then compute DT2.

   2NDDATE51.3124ENTER↓↓30ENTER↑CPT