Period#getYears

P5Y8M11D es el formato predeterminado de Period#toString . Puede obtener los componentes del período, por ejemplo, años, meses, días, etc. del objeto del Period según sus requisitos utilizando sus métodos de acceso correspondientes.

Manifestación:

 import java.text.DecimalFormat; import java.text.NumberFormat; import java.time.LocalDate; import java.time.Period; import java.util.Locale; public class Main { public static void main(String[] args) { LocalDate dateofbirth = LocalDate.of(1975, 7, 15); Period test = Period.between(dateofbirth, LocalDate.now()); System.out.printf("You have lived in the world for %d years.%n", test.getYears()); double years = test.getYears() + test.getMonths() / 12.0 + test.getDays() / 365.0; System.out.printf("You have lived in the world for %.2f years.%n", years); DecimalFormat format = (DecimalFormat) NumberFormat.getNumberInstance(Locale.GERMAN); format.applyPattern("#,##0.00"); String formattedValue = format.format(years); System.out.printf("You have lived in the world for %s years.%n", formattedValue); } }

Producción:

 You have lived in the world for 45 years. You have lived in the world for 45.36 years. You have lived in the world for 45,36 years.

Puede usar el formato de época para obtener segundos y compararlos:

 public static void main(String[] args) { LocalDate dateofbirth = LocalDate.of(1975, 7, 15); long duration = System.currentTimeMillis() / 1000 - dateofbirth.atStartOfDay().toEpochSecond(ZoneOffset.UTC); System.out.printf("You have lived in the world for %f years.%n", new Float(duration) / 3600 / 24 / 365); }