Date examples I bust out when I'm showing off Groovy

GroovyDates.groovy

def tomorrow = new Date() + 1
use (TimeCategory) {
   def appointment = now + 1.week + 1.days + 15.hours + 10.minutes
   def monday = new Date().with { it.clearTime(); it - it.calendarDate.dayOfWeek }
   def recurringWeeklyForYear = (1..52).collect { monday + it.weeks }   
}