Need help with tomorrows date

I have the rule below to set current date and I’m trying to get tomorrows date aswell (i.e today +1)
How can I do that?

Using OH2

The items involved:
DateTime todaysDate
DateTime tomorrowsDate

And the rule:

rule "Update Date"
when
Time cron “0 15 * * * ?” or
System started
then

logInfo("OutsideRules", "Updated Current Date")
todaysDate.postUpdate(new DateTimeType())		
tomorrowsDate.postUpdate( **What shall I Write here** )

end

tomorrowsDate.postUpdate(now.plusDays(1).toString)

Thank you, worked like a charm