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TI-83 Plus Tables and Reference Information 734
Actual/actual day-count method
(assumes actual number of days per
month and actual number of days per year):
dbd
( (days between dates) = Number of Days II
-
Number of Days I
Number of Days I = (
Y1
-
YB
)
×
365
+ (number of days
MB
to
M
1
)
+
DT
1
+
4
)1(
YBY
−
Number of Days II = (
Y
2
-
YB
)
×
365
+ (number of days
MB
to
M
2
)
+
DT
2
+
4
)2(
YBY
−
where:
M
1
= month of first date
DT
1
= day of first date
Y
1
= year of first date
M
2
= month of second date
DT
2
= day of second date
Y
2
= year of second date
MB
= base month (January)
DB
= base day (
1
)
YB
= base year (first year after leap year)