Your date format is different from the proposed one. To make things easy, you should be using this one:
20110905
20111015
20111016
20111017
20111018
20111019
20111020

[download]
Then, just generate the string for the day 45 days ago and remove everything lesser.
How to find what that days' date was? How yould you proceed without a computer? Would you calculate the date, or just have a look into a calendar?

In reply to Re^3: Delete Old Directories by choroba
in thread Delete Old Directories by Anonymous Monk

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