Texas Instruments BA II PLUS User Manual page 97

where: =month of first date
M1
1 =day of first date
DT
Y 1 =year of first date
2 =month of second date
M
2 =day of second date
DT
2 =year of second date
Y
MB =base month (January)
DB =base day (1)
=base year (first year after leap year)
YB
30/360 day-count method
Note: The method assumes 30 days per month and 360 days per year.
(
DBD = Y2 –
where: 1 =month of first date
M
1 =day of first date
DT
1 =year of first date
Y
M 2 =month of second date
2 =day of second date
DT
2 =year of second date
Y
Note: If 1 is 31, change
DT
change 2 to 30; otherwise, leave it at 31.
DT
2. 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
Appendix — Reference Information
2
Y1 ) × (
360 + M2
1 to 30. If
DT
M1 ) × (
+ 30 + DT2
2 is 31 and
DT
DT1 )
–
1 is 30 or 31,
DT
93