DateLayoutRenderer default Format should be culture invariant #6232

Little weird that DateLayoutRenderer has the default Format:

• yyyy/MM/dd HH:mm:ss.fff

Why not follow the default-format found every where else in NLog:

• yyyy-MM-dd HH:mm:ss.ffff

Interesting that ${date} "originally" was born with default Format = G, that would follow the local culture. Then later hard-coded to one culture with explicit Format-string (with ffff). Think that Logging library should stay culture invariant unless requested otherwise.

Also $[processtime} should match the following format (Instead of fff):

• HH:mm:ss.ffff