Texas Instruments BA II PLUS - Manual (Page 97)

Appendix — Reference Information 93
where: M1 =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)
30/360 day-count method
2
Note: The method assumes 30 days per month and 360 days per year.
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 DT 1 is 31, change DT 1 to 30. If DT 2 is 31 and DT 1 is 30 or 31,
change DT 2 to 30; otherwise, leave it at 31.
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
DBD Y2
(
Y1
)
– 360
×
M2
(
M1
)
+ + 30
×
DT2
(
DT1
)
– + =