Timepicker min and max

[ssimo3lsuhsc]

This may be relevant to #5957, or it may be its rightful new issue. I have no clue where to go when asking simple questions other than to post an issue and ignore GitHub's auto-generated warning. My question is this:
I'm trying to use a Timepicker with min and max. I want to know what type of data the expression to which these Angular expressions are bound should return.

1. A string in the format "HH:mm", where "H" ranges from 00 to 23
2. A date with 1970 as the year, 0 as the month, and 1 as the day
3. Any Date object; the year, month and day are ignored when validating the data.
4. A Julian date