This document explains how the day display and calendar features work for the 12c, 17bii, and 19bii calculators.
HP 12c, 17bii, 17bii+, and 19bii Calculators - Day and Calendar Displays
When the days between xx.xxxxxx and yy.yyyyyy are counted, an answer appears. Then, when one day is added to yy.yyyyyy the same number appears
HP 12c calculator
A 30/360 calendar is being used, not the actual/actual calendar. If the 30/360 calendar is used, get a count using the formula in Figure 1 and 2. In some cases this formula causes the same day count between 2 different y-register dates.
Figure : Actual day basis formula
Figure : 30/360 day basis
HP 17bii, 17bii+, and 19bii calculators
A 30/360 360D calendar is being used, not the actual/actual 365D calendar. If the actual calendar is used, an actual count of the number of days between DATE1 and DATE2 appears. If the 30/360 calendar is used, a count using the formula in Figure 3 appears. In some cases this formula causes the same day count between 2 different DATE2 days.
Equations apply when DATE1 precedes DATE2.
Figure : Time
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