In general, the answer to your question is "yes", but you haven't given us
anywhere near enough information for us to tell you how for your particular
situation. For example, when you say "every other day", to you mean (as an
example) Monday, Wednesday and Friday for each week, or do you mean you
don't have any days off except those "in between days" so your schedule
would be Monday, Wednesday, Friday, Sunday, Tuesday, Thursday, Saturday,
Monday, etc.? If the later, then you will also have to tell us one of your
actual work dates so we have a starting point to calculate from. So... what
is your actual work days? Also, where are these dates that you want colored
in located at (that is, what row or column and which cells in that row or
column)?