Texas Instruments BA-20 Profit Manager User Manual - Page 97

day-count method, base year first year after leap year

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where: M1 =month of first date DT1 =day of first date Y1 =year of first date M2 =month of second date DT2 =day of second date Y2 =year of second date MB =base month (January) DB =base day (1) YB =base year (first year after leap year) 30/360 day-count method2 Note: The method assumes 30 days per month and 360 days per year. DBD = (Y2 - Y1 ) × 360 + (M2 + M1 ) × 30 + (DT2 - DT1 ) where: M1 =month of first date DT1 =day of first date Y1 =year of first date M2 =month of second date DT2 =day of second date Y2 =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. 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 93

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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
Y
2
(
Y
1
)
–
360
×
M
2
(
M
1
)
+
+
30
×
DT
2
(
DT
1
)
–
+
=