Embedding date function in Excel VBA

Hello,
Based on my very limited knowledge about VBA I must once again ask for help, but I'm a fast learner.
I have a macro that sends emails. The outlook email body needs to contain the first day of the next month.
I have this line in my macro:

strbody = strbody & "the cases listed below are scheduled to be closed out in our system on " & "<b>Format(DateSerial(Year(Now()), Month(Now()) + 1, 1), (dd-mm-yyyy))</b>" & "." & "<br>"

The current output to outlook looks like this:

the cases listed below are scheduled to be closed out in our system on Format(DateSerial(Year(Now()), Month(Now()) + 1, 1), (dd-mm-yyyy)).

Cant find how to get the date function to work.
I'm using Office 365.
Any help is greatly appreciated!
Thank you in advance!

Use :
vMyDate = date() 'or some other date

'add 1 month
vMyDate = dateadd("m",1,vMyDate)

'format
format(vMyDate,"dd-mm-yyyy")

Thank you! I'm sorry, still don't know how to insert the function in the strbody. Tried various ways.

Thank you! Getting closer, it now returns "44958", could that be the boolean date?

That almost worked, lol. But you pointed me in the right direction.
Played around with it and removed some quotes and parenthesis. It's now working!
Here is the final function in case you need it in the future: Format(DateSerial(Year(Now()), Month(Now()) + 1, 1), "mm-dd-yyyy")
Thank you so much for your help, I really appreciate it. Enjoy the rest of your day!
Larz

Understood, sometimes it can be trial and error. Still new to VBA but persistency pays off. Thanks again for your help, added to your reputation and marked the thread solved.
Cheers!