Thank you; your DateTime incantations work perfectly. I was aware of the issue of ambiguous time zones, but was hoping the longer form output by Time::Piece might work. I can confirm that I have retried the capitalisation of "z" and Time::Piece remains insensitive while DateTime works as expected. It may be a function of Windows 2019 server or Strawberry (This is perl 5, version 32, subversion 1 (v5.32.1) built for MSWin32-x64-multi-thread), but with your fix I'm not investigating further.

Regards,

John Davies