124
BA II PLUS™ Calculator
30/360 day-count method
(assumes 30 days per month and 360 days per year):
DBD
Y
Y
M
M
DT
DT
=
−
×
+
−
×
+
−
(
)
(
)
(
)
2
1
360
2
1
30
2
1
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
Note: If DT1 is 31, change DT1 to 30. If DT2 is 31 and DT1 is 30 or 31,
change DT2 to 30; otherwise, leave it at 31.
Source for 30/360 day-count method formula: Lynch, John J.,
Jr., and Jan H. Mayle.
Standard Securities Calculation
Methods
. New York: Securities Industry Association, 1986.
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