Help me write the constraints for day of week

or

you have any suggestion for a more elegant way to achieve beblow

Solved it

Simply put the {DATE:ddd} in the COMMAND VALUE box solves the problem, no constraints needed. Just match the value to the Order Tags.

But anyway I would like to see some examples on how to write constraints using system variables and functions. Anyone can show me some?

Try looking at almost any tutorial…
As example would be
‘{DATE:ddd}’ == ‘Mon’

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