Comparing Dates List with MAX Date

Question

I have an output $a and $b with MAX date as shown below: I would like to compare both $a and $b which contains dates and get the results. The $a and $b will change on a daily basis. The goal is to get everything after the MAX Date everyday. The MAX date changes daily as new data is loaded with date and $a changes daily to.

This is how $a is derived:

$access_token ="Access_Token"

$URI =  "https://XXXXX"
$headers = @{“authorization” = “Bearer $access_token”} 
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
$result = Invoke-RestMethod -Uri $URI -Headers $headers -ContentType $ContentType |ConvertTo-Json
$a = $Result|ConvertFrom-Json| Select -ExpandProperty Forms

$a= 

id          date
--------    -----------
Person 1    01/02/2017 10:59:15
Person 2    02/03/2017 13:10:19
Person 3    04/05/2017 11:11:12
Person 4    10/10/2017 10:42:19
Person 5    10/10/2017 13:34:58

$b= 

MAX_Date
02/03/2017 13:10:19 

Desired results:

id          date
--------    -----------
Person 3    04/05/2017 11:11:12
Person 4    10/10/2017 10:42:19
Person 5    10/10/2017 13:34:58

Answer 1

As Mathias said, we need more details. But to give you a head start the following would work:

$A = @(
    [PSCustomObject]@{
        id   = 'Person 1'
        date = [DateTime]'01/02/2017 10:59:15'
    }
    [PSCustomObject]@{
        id   = 'Person 2'
        date = [DateTime]'02/03/2017 13:10:19'
    }
    [PSCustomObject]@{
        id   = 'Person 3'
        date = [DateTime]'04/05/2017 11:11:12'
    }
    [PSCustomObject]@{
        id   = 'Person 4'
        date = [DateTime]'10/10/2017 10:42:19'
    }
    [PSCustomObject]@{
        id   = 'Person 5'
        date = [DateTime]'10/10/2017 13:34:58'
    }
)

$B = @{
    MAX_Date = [DateTime]'02/03/2017 13:10:19 '
}

$A | Where-Object { $_.date -gt $B.MAX_Date } | Sort-Object id