I've tried the following two options:
DateTime dt = new DateTime();
dt = dt.plusDays(1).withMinuteOfHour(0);
and
DateTime dt = new DateTime();
dt = dt.withMinuteOfHour(0);
they both report the following error message:
Method "withMinuteOfHour" with signature "(I)Lorg/joda/time/DateTime;" is not applicable on this object
I'm using joda time 2.3:
joda-time:joda-time:2.3