get files/folders not written within a specific date range - powershell

Question

Whats the powershell command for finding files in a folder that do not meet a criteria of date range for the Get-Childitem filter of LastWriteTime.
So, check to see if a directory has files that DO NOT contain any files that have LastWriteTime between 01/10/2012 (1st Oct) to 25/10/2012 (25th Oct).
I want to display the folders that DO NOT have any files that are in that range...that way I know they are old and the whole directory can be deleted.
example of this is:
Folder1 - some files written within October - ignore this whole folder and do not display these in the results
Folder2 - NO file has LastWriteTime written in the month of October and so this folder and files should be displayed.
I know this can be done with Get-ChildItem and I am stuck on the bit below..
Get-ChildItem E:\LogArchive -Recurse | Where-Object{$_.LastWriteTime.......?

Answer 1

Simple solution off top of the head is this:
Where-Object{ $_.LastWriteTime -lt $startDate -or $_.LastWriteTime -gt $endDate }
where $startDate is 01/10/2012 (1st Oct) and $endDate is 25/10/2012 (25th Oct).
Problem with this approach is that it does not account for time factor in the [datetime]. So in your example, if you have 25-Oct-2012 as an upper bound, it will return files created at 25-Oct-2012 9:00, which you may not want.
Below code calculates [datetime]'s with time part truncated, based on the input [datetime], and builds the month-to-date date range of ($dayStart, $dayEnd):
$entry_date = "20-Oct-2012 9:00" #to feed current date, use this: Get-Date
$dayEnd = Get-Date $entry_date -Minute 0 -Hour 0 -Second -0;
$dayStart = Get-Date $endDate -Day 1;
$dayStart, $dayEnd
For this sample code, here is the output:
Monday, October 01, 2012 12:00:00 AM
Saturday, October 20, 2012 12:00:00 AM
Notice this approach is flexible, because you can set $entry_date to either Date or String, and it may or may not have time part - it will work in all those cases. You can then have this code in Where-Object:
Where-Object{ $_.LastWriteTime -lt $dayStart -or $_.LastWriteTime -ge $dayEnd.AddDays(1) }
Notice how -ge $dayEnd.AddDays(1) fixes the issue when comparing 25-Oct-2012 to 25-Oct-2012 9:00.

Answer 2

Try this:
[datetime]$startDate = "10/01/2012" # or $startDate = get-date -Date 1/10/2012
[datetime]$endDate = "10/25/2012" # or $endDate = get-date -Date 25/10/2012
? { $_.LastWriteTime -lt $startDate -or $_.LastWriteTime -gt $endDate }