Casio SP-100USNU - Nursing and Pharmacy Calculations (continued); Date Calculation Example (Days Before)

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Example: To calculate the date 100 days before January 1, 2020
1 Auu
If something else is displayed, press u again.
2 200101
For the year, use the two rightmost digits of the Gregorian year.
3 =
1 2 3
Days bfr / aftr / prd
4 Press 1 to select “bfr” (before).
Days before?
[
=
]
(2 selects “aftr” (after), 3 selects “prd” (period).)
5 100=
2019 - 09 - 23
100 days before:
6 =
Base date? 20yy mm dd
[
=
]
2020 - 01 - 01
Base date? 20yy mm dd
[
=
]