23 lines
628 B
Bash
23 lines
628 B
Bash
#!/usr/bin/env bash
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day-of-the-week()
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if [[ "$1" =~ ([0-9]{4})-([0-9]{2})-([0-9]{2}) ]]
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then
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local -ra names=({Sun,Mon,Tues,Wednes,Thurs,Fri,Satur}day) doomsday=({37,41}7426415375)
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local -i i c s t a b
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local -i {y,m,d}=${BASH_REMATCH[++i]}
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echo ${names[
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c=y/100,
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s=(y%100)/12,
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t=(y % 100) % 12,
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a=(5*(c%4)+2) % 7,
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b=(s + t + (t / 4) + a ) % 7,
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(b + d - ${doomsday[(y%4 == 0) && ((y%100) || (y%400 == 0))]:m-1:1} + 7) % 7
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]}
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else return 1
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fi
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for date in 1800-01-06 1875-03-29 1915-12-07 1970-12-23 2043-05-14 2077-02-12 2101-04-02
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do day-of-the-week "$date"
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done
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