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# a core method determine start/end dates of prior months use strict; use warnings; ... return ($date,$ym,$ymd); }
2017 06 | 2017 06 01 | 2017 06 23 2017 05 | 2017 05 01 | 2017 05 31 ... 2015 08 | 2015 08 01 | 2015 08 31 2015 07 | 2015 07 01 | 2015 07 31 2015 06 | 2015 06 01 | 2015 06 30