Excel =now() to change the hour not the day

Question

Good day. I am using excel and in one cell I have

=now()

When I do =now() -1 or + 1 it adds one day to my date. How do I do this method but instead of changing the days it changes the hour? Using =Time is not possible for me because I need the date as well. Is concatenation my only hope in being able to modify the hour within a date? Thank you

Answer 1

As as commented by simoco use: =now() + 1/24