diff options
Diffstat (limited to 'usr.bin/cal/README')
| -rw-r--r-- | usr.bin/cal/README | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/usr.bin/cal/README b/usr.bin/cal/README index 638ac9dffb6..83051657ee2 100644 --- a/usr.bin/cal/README +++ b/usr.bin/cal/README @@ -10,13 +10,13 @@ that even if I was dumb enough to try. From this we can easily calculate the day of week for any date. The algorithm for a zero based day of week: calculate the number of days in all prior years (year-1)*365 - add the number of leap years (days?) since year 1 + add the number of leap years (days?) since year 1 (not including this year as that is covered later) add the day number within the year this compensates for the non-inclusive leap year calculation if the day in question occurs before the gregorian reformation - (3 sep 1752 for our purposes), then simply return + (3 sep 1752 for our purposes), then simply return (value so far - 1 + SATURDAY's value of 6) modulo 7. if the day in question occurs during the reformation (3 sep 1752 to 13 sep 1752 inclusive) return THURSDAY. This is my |