Data format for 'start' and 'end' metadata

Dear @Josh,
Yes, we would like - as standard - to have ONLY those (few) values as text which cannot be converted by KoBo without loss of content or format-structure, like the long date-time-timezone combinations as start.or end, or the select_multiple combined text var.

An objective is to reduce reformatting work in Excel, SPSS etc., esp. after XLS download.
But we might also need to assure that those exported data can be reimported to KoBo.