Be careful with start and end dates when search for files or through event logs. Often people want to see what happened yesterday
If you do this
PS> $end = Get-Date
PS> $start = (Get-Date).AddDays(-1)
PS> $start
30 October 2016 16:32:35
PS> $end
31 October 2016 16:32:16
And you get the last 24 hours
if you really want just yesterday you need to create the exact dates and times
PS> $start = Get-Date -Day 30 -Month 10 -Year 2016 -Hour 00 -Minute 00 -Second 00
PS> $end = Get-Date -Day 31 -Month 10 -Year 2016 -Hour 00 -Minute 00 -Second 00
PS> $start
30 October 2016 00:00:00
PS> $end
31 October 2016 00:00:00
I know there are easier ways but using Get-Date shows exactly what’s happening and is simple