Should I store a time as datetime in my db?

I have a field that is going to hold a time. Since Rails "knows" the
MySQL type datetime, should I use that instead of the type "time" and
just leave the feild portions of datetime blank?

Second Question:
What I am really trying to do is save a day of the week and time in a
field i.e. Sunday 7:00pm
Right now I have a varchar holding the day of the week seperate from
the time. Is this the best way to do this, yes?

Thanks everyone for the help!

-Bradly

I'm no expert, but I would suggest using the datetime field type,
saving the date/time in full (Time.now), and then writing two methods
in your model that return the day of the week and the time formatted as
you wish.