I found this in an old programmable calculator
library manual:
'The number of days between dates is found by
calculating the FACTOR for each date, then
finding the difference between the FACTORS.
For January and February:
FACTOR = 365 * y + d + 31 * (m - 1) +
int((y - 1) / 4) -
int(3 / 4 * int((y - 1) / 100 + 1))
For March through December:
FACTOR = 365 * y + d + 31 * (m - 1) -
int(0.4 * m + 2.3) + int(y / 4) -
int(3 / 4 * (int(y / 100) + 1)
The day of the week is determined from the
FACTOR for that date as follows:
dayofweek = FACTOR + int(-factor / 7) * 7
where the day is represented by a single digit 0
through 6 for Saturday through Friday'
(that is sat=0, sun=1, etc.)
I thought you might like to just have an equation
to cut and paste into your code :-)
Cheers,
Gerardo
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