The Time Span processor uses the .Net custom TimeSpan format in its input-format and output-format fields: https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-timespan-format-strings
Its most common use is to convert a cue duration into milliseconds (the format string “fff”).
The Date Time processor uses the .Net custom DateTime format for both input-format and output-format: https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings
It also supports following keywords:
UNIX: unix time stamp in seconds
STW: unix time stamp in milliseconds
TICKS: 100-nanosecond intervals that have elapsed since January 1, 0001 at 00:00:00.000 in the Gregorian calendar