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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