Calculate age in Years, Months, Days, Hours, Minutes, and Seconds

Question

I need to take a birthday entered by the user (preferably in dd/mm//yyyy format) and find their age, based on todays date. Could someone explain to me the proce

Answer 1

java.time

Using the java.time framework built into Java 8 and later. Example is copy pasted directly from Tutorial (with small modifications).

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

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d/M/yyyy");    
LocalDate today = LocalDate.now();
LocalDate birthday = LocalDate.parse("1/1/1960", formatter);


Period p = Period.between(birthday, today);
System.out.println("You are " + p.getYears() + " years, " + p.getMonths() +
                   " months and " + p.getDays() +
                   " days old.");

The code produces output similar to the following:

You are 53 years, 4 months and 29 days old.

In my opinion it doesn't make sense to output hour, minutes and seconds because you probably won't have such precise data in your DB. That is why example uses LocalDate instead of LocalDateTime.