Build ID: f3153a8b245191196a4b6b9abd1d0da16eead600
Op.Sys: Windows 10
It is not possible to change the field’s properties in CALC. In WRITER the equivalent field’s properties can be modified so that the date is in ISO8601 format.
This is concerning the ‘Format’ > ‘Page’ properties ‘Header’ and ‘Footer’ for printing as well.