If you're a cheap b*d like myself, use this script to print a list of old calendars which can be used again
---
reference: http://webexhibits.org/calendars/year-definitions.html
array set R {0 {28} 1 {6 17 28} 2 {11 17 28} 3 {11 22 28}}
set this_year 2006
set last_year 2040
for {set year [expr {$this_year - 28}]} {$year < $last_year} {incr year} {
foreach r $R([expr {$year % 4}]) {
lappend Y([expr {$year + $r}]) $year
}
}
for {set year $this_year} {$year <= $last_year} {incr year} {
puts "$year : $Y($year)"
}