Texas Instruments Calculator - Manual (Page 99)

Appendix — Reference Information 95
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
3
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.
3. 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 ) – + =