Keep files from first of the month for a year

Question

We have a series of folders with subfolders that have logfiles in them. Each folder has new log files generated daily. However on occasion, a log file is not generated for a day or for a few days.
I want to keep the log file in each folder for the first of each month, or as close to the day as possible for a year and delete all files older than a year. I also want to delete all files in that folder that are not from the first of the month.
So, on August 30, 2014 Folder 1 may have log files from each day in August except for August 1. When I run my script on September 1, I want the folder to have files:
August 02, 2014.log
July 01, 2014.log
June 01, 2014.log
If the first log file is August 5th, then I want to keep that one and delete the rest.
I currently have 30+ folders that get daily log files. It takes a long time to go into each folder, see which log is closest to the beginning of the month, delete the remaining files from that month, then find the log files from over a year ago and delete
that one.
Ive tried a few iterations but, keep getting stuck. Any help would be appreciated.
Thanks!
Steve

Answer 1

Hi Mike,
I have been looking at those.  One of the problems Ive had is with the date/time format.
For instance, if I issue
$testDate=$(Get-Date).addDays(-$(Get-Date).Day).addMonths(-3)
$testdate gets set to Saturday, May 31, 2014 12:51:59
When I look for files based on 5/31/2014 it doesn't match because there are no files created at 12:51:59
Im not sure how to convert $testdate to date only and not time.  Saturday, May 31, 2014 12:51:59 PM
Saturday, May 31, 2014 12:51:59 PM