(Please use a more descriptive title for your questions)

In pseudocode, your solution would be something like this:

• Get date two weeks ago (using time and some basic arithmatic to subtract 14 day's worth of seconds)
• Open directory handle with opendir
• For each file read from the directory handle with readdir...
  • Ignore file unless is starts with DATE_ (check with a regular expression)
  • Parse date and time out of filename (using a regex)
  • If parsed date is less than the two week's ago date that you calculated at the start then delete the file
• Read next file from directory handle

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