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Groovy startOfDay endOfDay nextDayStart

/ Published in: Groovy
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  1. // TODO check to see if calcs are correct for spring and fall DST changes.
  2.  
  3. def startOfDay( java.util.Date aDate ) {
  4.     final long MS_PER_DAY = (24 * 60 * 60 * 1000);
  5.     long tzOffset = java.util.TimeZone.getDefault().getOffset( aDate.time );   
  6.     long msSinceMidnight = aDate.time % MS_PER_DAY;
  7.     return new java.util.Date( aDate.time - msSinceMidnight - tzOffset );
  8. }
  9.  
  10. def endOfDay(  java.util.Date aDate ) {
  11.     final long MS_PER_DAY = (24 * 60 * 60 * 1000);
  12.     def long startMs = startOfDay( aDate ).time;
  13.     def long endMs = startMs + MS_PER_DAY - 1l;
  14.     return new java.util.Date( endMs );
  15. }
  16.  
  17. def nextDayStart( java.util.Date aDate ) {
  18.     final long MS_PER_DAY = (24 * 60 * 60 * 1000);
  19.     return new java.util.Date( (startOfDay(aDate).time + MS_PER_DAY) );
  20. }

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