evenlog-* formating datetime

[bodik]

https://github.com/bodik/defender/blob/923dbe3120692ec0f29c1924d8d7c3141744d5a5/tools/windows/toolbox/eventlog-logon.ps1#L55

https://docs.microsoft.com/en-us/dotnet/api/system.datetime.tostring?redirectedfrom=MSDN&view=netframework-4.7.2#System_DateTime_ToString_System_String_

ToString('u') generates 'Z' timezone output despite that data is in fact in localtime