Converting CSV data to datetime format-CodePudding

I'm still learning Powershell and in order to complete an assignment I need to convert written data in CSV files to a powershell accepted datetime format.

The dates in the CSV format are written as: 1-1-2014.

In order to convert them I found out (through a bit of brute force) that I can use the following code:

$Files = gci $Source\*.csv 

$Data = Import-CSV $Files -Delimiter ";"

$Data | ForEach-Object { $_.Time = $_.Time -as [datetime] 
$_ 
}

However, it would seem to me that this should work as well when written as follows:

$Data | ForEach-Object { $_.Time = $_.Time -as [datetime] $_ }

When I run it like that it returns a bunch of errors.

The $_ after [datetime] I also only added because a colleague used that in his functions, I don't really understand why it has to be put there, and why it needs to be put on a new line. Could anyone explain? If there is a different/better way to convert CSV data to a datetime format I'd be interested in hearing those as well, thanks in advance!

CodePudding user response：

The first (multi-line) version works because PowerShell interprets a line-break after a complete statement as a terminator - it knows that $_ is a separate statement from $_.Time = $_.Time -as [datetime].

To place multiple separate statements on a single line, you'll have to use a semicolon ; to separate them:

$Data | ForEach-Object { $_.Time = $_.Time -as [datetime]; $_ }