CODEWITHSUNDEEP
dategroovygrails
Tihom
Tihom

Reputation: 3394

Trying to compute age in groovy

I have a date object that holds a persons birthday. My code looks like:

def getAge(){
    //birthday, birthYear, birthMonth, birthDayOfMonth are class level properties
    def c= new GregorianCalendar(birthYear, birthMonth-1, birthDayOfMonth)
    birthday = c.time
    //What do I do now?
}

I need to return the age of the person. How do I do that in Groovy? The age only needs to be a integer.

Upvotes: 2

Views: 3433

Answers (3)

igilfanov
igilfanov

Reputation: 353

Date.metaClass.calculateAge = { Date offset = new Date() ->
        def birthdayThisYear = offset.clone().clearTime()
        birthdayThisYear[Calendar.MONTH]= delegate[Calendar.MONTH]
        birthdayThisYear[Calendar.DATE] = delegate[Calendar.DATE]
        return offset[Calendar.YEAR] - delegate[Calendar.YEAR] - (birthdayThisYear > offset ? 1 : 0)
    }

example of use:

def dateParser = new java.text.SimpleDateFormat("yyyy-MM-dd")
dateParser.lenient = false

dateParser.parse('1980-02-23').calculateAge()

Upvotes: 0

sbglasius
sbglasius

Reputation: 3124

I know this is question is old, but it inspired me to create this function, working on dates:

static Integer calculateAge(Date birthday, Date offset = new Date()) {
   def birthdayThisYear = offset.clone().clearTime()
    birthdayThisYear[MONTH]= birthday[MONTH]
    birthdayThisYear[DATE] = birthday[DATE]

    offset[Calendar.YEAR] - birthday[Calendar.YEAR] - (birthdayThisYear > offset ? 1 : 0)
}

You can either call it with the birthday alone to calculate the age today, or with a second argument, being the date where you want to calculate the persons age.

Upvotes: 4

Jack
Jack

Reputation: 133609

You can just create one calendar with the current date and use the year to compute age:

def now = new GregorianCalendar()
def fake = new GregorianCalendar(now.get(Calendar.YEAR), birthMonth-1, birthDayOfMonth)
return now.get(Calendar.YEAR) - birthYear - (fake > now ? 1 : 0)

the fake date is used to understand if birthday is already passed in current year, if it's not then you must substract 1 to the difference between years..

Upvotes: 6

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