How do I combine a manually entered Date field with a manually entered Time Field to generate a Date/Time field?

Can you tell us how you solved it? I am having the same issue.

ToTimeStamp([my date field], [my timeofday field])

So what type do I set this to? If I choose "Date" I get the error "expecting date but found datetime" and if I set to time, I get "expecting time but..."

I'm trying to get the calendar reports to place the events in their time slot, but we use separate date / time fields.

Date/Time formula field

ToTimestamp([Date],If(IsNull([Time]),ToTimeOfDay("12:00am"),[Time]))

there isn't a date/time formula field type option.

I still get the same error because I can only choose from date or time types.

I have
[scheduled activity date]
[scheduled start time]

as my fields.

Huh, sorry then, I'm not sure why you wouldn't be able to create a date/time formula field. That's what I did, and the above formula is what I used to combine my separate date and time fields. Good luck!

Here's what I'm seeing. Thanks for the help!

You're trying to create a calculated column? I would just create a new date/time formula field in that table.