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Oundroni
Asked: 2020-06-14 05:23:27 +0800 CST 2020-06-14 05:23:27 +0800 CST

Get age from date of birth in Java

  • 772

I want to calculate age from a date of birth in Date. I have tried with this code which seems to work fine, but is it the most convenient way?

 LocalDate hoy = LocalDate.now();   
 LocalDate nacimiento = usuarioActivo.getFechaNacimiento().toInstant().
           atZone(ZoneId.systemDefault()).toLocalDate(); 
 long edad = ChronoUnit.YEARS.between(nacimiento, hoy);
java

6 Answers

  1. Best Answer

    The Java 8 API for Dates and Times is tremendous. I use it and it is my favourite. You can use JODA as @Alejandro Rangel Celis tells you, which is compatible with older versions of Java.

    Java 8

    The way you have it is valid, but not quite correct because you don't take the months into account. For this you can use the Period class :

    import java.time.LocalDate;
import java.time.Period;
import java.time.format.DateTimeFormatter;

// 01/01/2000
DateTimeFormatter fmt = DateTimeFormatter.ofPattern("dd/MM/yyyy");
LocalDate fechaNac = LocalDate.parse("15/08/1993", fmt);
LocalDate ahora = LocalDate.now();

Period periodo = Period.between(fechaNac, ahora);
System.out.printf("Tu edad es: %s años, %s meses y %s días",
                    periodo.getYears(), periodo.getMonths(), periodo.getDays());

    Departure:

    Tu edad es: 22 años, 9 meses y 29 días
    • 15

  2. Check out Joda , it simplifies date and time calculations (Joda is also the basis for the new date/time apis standard in Java).

    Java 8 has something very similar and is worth checking out.

    Example

    LocalDate birthdate = new LocalDate (1970, 1, 20);
LocalDate now = new LocalDate();
Years age = Years.yearsBetween(birthdate, now);

    Here is a similar question on the English site.

    • 5 
  3. public static String getEdad(Date fechaNacimiento) {
    if (fechaNacimiento != null) {
        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
        StringBuilder result = new StringBuilder();
        if (fechaNacimiento != null) {
            result.append(sdf.format(fechaNacimiento));
            result.append(" (");
            Calendar c = new GregorianCalendar();
            c.setTime(fechaNacimiento);
            result.append(calcularEdad(c));
            result.append(" años)");
        }
        return result.toString();
    }
    return "";
}

private static int calcularEdad(Calendar fechaNac) {
    Calendar today = Calendar.getInstance();
    int diffYear = today.get(Calendar.YEAR) - fechaNac.get(Calendar.YEAR);
    int diffMonth = today.get(Calendar.MONTH) - fechaNac.get(Calendar.MONTH);
    int diffDay = today.get(Calendar.DAY_OF_MONTH) - fechaNac.get(Calendar.DAY_OF_MONTH);
    // Si está en ese año pero todavía no los ha cumplido
    if (diffMonth < 0 || (diffMonth == 0 && diffDay < 0)) {
        diffYear = diffYear - 1;
    }
    return diffYear;
}
    • 0

  4. I start to program java with NetBeans 11 and I just had this problem, I solved it in the following way: (I hope it works for you)

    import java.time.LocalDate;
import java.time.Month;
import java.time.temporal.ChronoUnit;
     LocalDate fHoy= LocalDate.now();
     LocalDate cumple= LocalDate.of(1990, Month.JUNE, 27);
     long edad= ChronoUnit.YEARS.between(cumple, fHoy); 
     System.out.println("tu edad es: "+edad);
    • 0 
  5. //declarar una fecha de nacimiento
LocalDate fechaNacimiento.of(1982, Month.June, 22);
//crear fecha de hoy para comparar
LocalDate fechaHoy = LocalDate.now();
//ahora comparar los años de las dos fechas y asi obtener la edad
int edad = fechaHoy.getYear() - fechaNacimiento.getYear();
    • -1 
  6. public void getEdad() {
        
    LocalDate hoy = LocalDate.now() ; 
    
    edad = hoy.getYear()-fechaNAci.getYear();
    
    System.out.println("edad : " + edad);
    
}
    • -1