Created
September 25, 2009 12:38
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| # Zeller's congruence | |
| # 0 => Sunday | |
| proc zeller {y m d} { | |
| set t {0 3 2 5 0 3 5 1 4 6 2 4} | |
| if {$m < 3} { incr y -1 } | |
| expr {($y + $y/4 - $y/100 + $y/400 + [lindex $t $m-1] + $d) % 7} | |
| } |
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