Plan 9 from Bell Labs’s /usr/web/sources/contrib/quanstro/timezone/gendstpairsca

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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#!/bin/rc
pat = $1
if(~ $#pat 0)
	pat = '{print}'
fn q {
	seq $* | awk $pat
}

for(year in `{q 1970 1986})
	echo $year `{dateof $year apr sun last>[2=]} `{dateof -w1 $year oct sun last>[2=]}
for(year in `{q 1987 2006})
	echo $year `{dateof $year apr sun 1>[2=]} `{dateof -w1 $year oct sun last>[2=]}
for(year in `{q 2007 2037})
	echo $year `{dateof $year mar sun 2>[2=]} `{dateof -w1 $year nov sun 1>[2=]}

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