Texas Instruments TI-84 Plus Manual Book page 192

where: x
Eff
CP
Nom
Days between Dates
With the
dbd(
range Jan. 1, 1950, through Dec. 31, 2049.
Actual/actual day-count method (assumes actual number of days per
month and actual number of days per year):
dbd( (days between dates) = Number of Days II - Number of Days I
Number of Days I
Number of Days II
where: M1
DT1
Y1
M2
DT2
Y2
MB
DB
YB
186
= .01 × Eff
= effective rate
= compounding periods
= nominal rate
function, you can enter or compute a date within the
= (Y1-YB) × 365
+ (number of days MB to M1)
+ DT1
(
+
Y1 YB
------------------------
= (Y2-YB) × 365
+ (number of days MB to M2)
+ DT2
(
+
Y2 YB
------------------------
= month of first date
= day of first date
= year of first date
= month of second date
= day of second date
= year of second date
= base month (January)
= base day (1)
= base year (first year after leap year)
)
–
4
)
–
4
Appendix B: Reference Information