17 lines
536 B
Factor
17 lines
536 B
Factor
USING: calendar calendar.format formatting io kernel math
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sequences ;
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: timestamps>my ( months -- )
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[ { MONTH bl YYYY nl } formatted 2drop ] each ;
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: month-range ( start-year #months -- seq )
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[ <year> ] [ <iota> ] bi* [ months time+ ] with map ;
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: find-five-weekend-months ( months -- months' )
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[ [ friday? ] [ days-in-month ] bi 31 = and ] filter ;
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1900 12 201 * month-range find-five-weekend-months
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[ length "%d five-weekend months found.\n" printf ]
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[ 5 head timestamps>my "..." print ]
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[ 5 tail* timestamps>my ] tri
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