How do I search for documents by date?

Launch a Finder, or Spotlight window. In the Search window, type any of the following:

• date:12/20/15

  Find all files for this date

• date: 12/19/15-12/21/15

  Find all files in this date range

• created: today

  Find all files created today

• modified: 12/15/15

  Find all files modified on this date

• accessed: 12/21/15

  Find all files with this last access date

• date: 12/20/15 AND kind:Python

  Any Python Script on this date

• modified: 12/20/15 AND (kind:Python OR kind:PDF)

  Any Python Script or PDF document modified on given date

I use find any file.app

http://apps.tempel.org/FindAnyFile/

The following is accurate for El Capitan but I don't believe Yosemite was significantly different. Open Finder and then use the Command F key combination to show search option in the bar above where the file list normally appears. That will allow you to search by a number of different date criteria (e.g., Date Created, Last modified date, and others).