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July 1, 2010

Groovy Goodness: Clear Time Portion of a Date

Working with dates in Groovy is easy. We get a lot of extra functionality compared to the standard Java Date class. One of the extra methods added to the Date class since Groovy 1.6.8 is clearTime(). With clearTime() we reset the time portion of a date to 12 o'clock midnight. This makes it easier to compare dates if we only are interested in the date, month, year parts.

// Create new date.
def d = new Date(year: 2010, month: Calendar.JULY, date: 1, 
                                hours: 7, minutes: 12, seconds: 0)

assert '7/1/10 7:12:00 AM' == d.dateTimeString

// Reset time portion of the date.
d.clearTime()

assert '7/1/10 12:00:00 AM' == d.dateTimeString