Cannot change internet time server

Using the Adjust Date/Time applet If I attempt to change anything i
"Date Time > Internet time > Change settings" I get the pop up messag
"An Error Occurred" "Your changes could not be saved".

This means I cannot change the default "time.windows.com" server to
local time server that will work better in my part of the world

Any suggestions would be appreciated

Note: I can adjust the date/time manually without problem

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CliveM