How to find the number of days between two dates in java or groovy?

Question

I have a method which uses following logic to calculate difference between days.

long diff = milliseconds2 - milliseconds1;
long diffDays = diff / (24 * 60 *         


        

Answer 1

Date.metaClass.calculateDays = { Date offset = new Date() ->            
    Long result = null
    Date date = delegate
    use(groovy.time.TimeCategory) {
        result = (offset - date).days as Long
    }            
    result            
}

example of use:

def sdf = new java.text.SimpleDateFormat("yyyy.MM.dd")

sdf.lenient = false

Date date = sdf.parse("2015.10.02")

println date.calculateDays() 

println date.calculateDays(sdf.parse("2015.11.02"))