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shift_and_tag ensures that all other dates in the XML-file are adjusted in reference to today's date.
Afterwards it will update the 'recorddatetime'-tag.
The 'recorddatetime'-tag needs to exist in the XML-file prior to executing it, else it will not work.
Example:
Suppose that today's dat is :
no_tag_and_no_shift will not create or update the 'recorddatetime'-tag and it will not adjust all other dates according to today's date.
If there is a 'recorddatetime'-tag in the XML-file and you run EVS with no_tag_and_no_shift, the tag will be removed.