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A-58 Tables and Reference Information
8399APXA.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 1:25 PM Printed: 02/19/01 1:40 PM
Page 58 of 58
With the dbd( function, you can enter or compute a date
within the range Jan. 1, 1950, through Dec. 31, 2049.
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
+
()
YYB
1
4
−
Number of Days II = (
Y
2
-
YB
)
×
365
+ (number of days
MB
to
M
2)
+
DT
2
+
()
YYB
2
4
−
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)
Days between
Dates