Nearing the "do what I mean" principle..
* key date on time cell => current date + time of cell => date+time formatted cell
* unless time cell was empty or 00:00 time => current date => date formatted cell
* key date on date+time cell => current date + 00:00 time => date+time formatted cell
* unless date was current date => current date => date formatted cell
* key date on other cell => current date => date formatted cell
* key time on date cell => date of cell + current time => date+time formatted cell
* unless date cell was empty => current time => time formatted cell
* key time on date+time cell => current time => time formatted cell
* unless cell was empty => current date+time => date+time formatted cell
* key time on other cell => current time => time formatted cell
Change-Id: I5025e0d0ea9ac83d1b9e0b130262df6db4693a56
