parsedatetime is able to parse, for example, the following:

  • August 25th, 2008
  • 25 Aug 2008
  • Aug 25 5pm
  • 5pm August 25
  • next saturday
  • tomorrow
  • next thursday at 4pm
  • at 4pm
  • eod
  • tomorrow eod
  • eod tuesday
  • eoy
  • eom
  • in 5 minutes
  • 5 minutes from now
  • 5 hours before now
  • 2 hours before noon

via parsedatetime – Google Code.