How can I bulk change file names from UK date format to ISO format using PowerShell?

I’ve got this whole process figured out! Here’s a method:

1. List your files with `Get-ChildItem`.
2. Replace `.` with a hyphen to eliminate any issues with extensions.

```powershell
(Get-ChildItem).Name.Replace('.', '-')
```

3. Convert this to an array of objects, then format the strings to rename them as needed.
4. Finally, you can execute the renaming command as needed!

Make sure to check the output to ensure it's correct before you run the final command.

Another option is to try Advanced File Renamer, which is a handy tool specifically for batch renaming files.

If you're looking for a simpler solution, there are bulk rename tools available for free that can handle this without using PowerShell. Just search for a bulk rename app, and you should find one that fits your needs!

For learning basics, I'd recommend r/cs50 style resources, which cover foundational programming skills applicable across languages. These can help you figure out systematic solutions to coding problems you might face!

You can use this command to rename your files:

```powershell
Get-ChildItem -Recurse -File | Rename-Item -NewName {
$currentDate = $_.Name -replace '.*(d+-d+-d+).*', '$1'
$newDate = try {
[datetime]::ParseExact($currentDate, 'dd-MM-yyyy', $null)
} catch {
[datetime]::ParseExact($currentDate, 'd-MM-yyyy', $null)
}
$_.Name -replace $currentDate, $newDate.ToString('yyyy-MM-dd')
} -WhatIf
```

Using `-WhatIf` at the end lets you see the changes before making them, which is a good idea for safety.