Here are some quick conversion methods between time values represented by Integer and DateTime data types:

# Convert from LastlogonTimeStamp to Date Time
[DateTime]::FromFileTime($_.LastLogon)
# Convert from DateTime to Lastlogon TimeStamp
$daysLimit=30
$limitTimestamp=(get-date).AddDays(-$daysLimit).ToFileTime()
$limitTimestamp.ToFileTime()
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