In Omnifocus, smart dates are:

  • Soft Date = Assign any of the following Tags:
    • THIS WEEK
    • NEXT WEEK
    • THIS MONTH
    • NEXT MONTH
  • Hard Date = Assign a Due Date.
  • Someday/Maybe = Someday tag.
  • Deadline = (MM/DD) or (DD/MM) entered after project or task name.
  • Do Today = Flag task as Do Today.