Convert to and from Epoch Time using PowerShell

Converting date and time to Epoch (Unix) time, and Epoch time back to human readable date.

1. Regular time to Epoch time

# Get current date and time
PS C:\> $DateTime = Get-Date
 
# Convert to Epoch
PS C:\> $EpochTime = Get-Date $DateTime -UFormat %s

# $EpochTime
# 1616758238.2857

2. Epoch to Human Readable Date

# Get the actual Epoch Timestamp to work with
PS C:\> $EpochTime = Get-Date -UFormat %s

# Convert to regular date
PS C:\> $DateTime = (([System.DateTimeOffset]::FromUnixTimeSeconds($EpochTime)).DateTime).ToString()

# $DateTime
# 26/03/2021 11:30:38