您可以按todate转换所有值，并按><==符号进行比较。例子：

R = FILTER A BY ToDate(date1, 'M/d/yyyy') <= ToDate(date2, 'YYYY-mm-dd');

Dump A;
1/22/2016

B = foreach A generate ToDate($0,"M/dd/yyyy");
C = foreach B {

  year = (chararray)GetYear($0);
  month = (chararray)GetMonth($0);
  day = (chararray)GetDay($0);
  generate CONCAT(CONCAT(CONCAT(year, '-'), CONCAT(month, '-')),day) as myDate;
}

Dump C;
(2016-1-22)