Java Utililty Methods LocalDate Calculate

List of utility methods to do LocalDate Calculate

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Description

The list of methods to do LocalDate Calculate are organized into topic(s).

Method

LocalDateconverterToLocalDate(final String date)
converter To Local Date 
return LocalDate.parse(date);
StringconvertLocalDateToDatabaseDateString(LocalDate localDate)
convert Local Date To Database Date String 
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
return localDate.format(formatter);
LocalDatedateToSystemLocalDate(Date d)
Takes a java.util.Date and turns it into a LocalDate based on the systems default timezone. 
return d.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
intdaysAgo(LocalDate pastDate)
days Ago 
return 0;
intdoy(LocalDate date)
Finds the day-of-year of the date. 
int[] lookup = (date.isLeapYear() ? LEAP : STANDARD);
return lookup[date.getMonthValue()] + date.getDayOfMonth();
char[]fastDateWrite(LocalDate localDate)
fast Date Write 
char[] c = new char[10];
int y = localDate.getYear();
c[0] = (char) ('0' + y / 1000);
c[1] = (char) ('0' + ((y % 1000) / 100));
c[2] = (char) ('0' + ((y % 100) / 10));
c[3] = (char) ('0' + (y % 10));
c[4] = (char) ('-');
int m = localDate.getMonthValue();
...
char[]fastDateWriteWeeks(LocalDate localDate)
fast Date Write Weeks 
char[] c = new char[7];
int y = localDate.get(yearOfWeek);
c[0] = (char) ('0' + y / 1000);
c[1] = (char) ('0' + ((y % 1000) / 100));
c[2] = (char) ('0' + ((y % 100) / 10));
c[3] = (char) ('0' + (y % 10));
c[4] = (char) ('W');
int w = localDate.get(weekOfYear);
...
intgetAge(LocalDate birthday)
get Age 
LocalDate now = LocalDate.now();
int age = now.getYear() - birthday.getYear();
if (age <= 0) {
    return 0;
int currentMonth = now.getMonthValue();
int currentDay = now.getDayOfMonth();
int bornMonth = birthday.getMonthValue();
...
intgetAge(LocalDate birthDay)
get Age 
return LocalDate.now().getYear() - birthDay.getYear();
DategetDate(ChronoLocalDate date)
get Date 
LocalDate localDate = LocalDate.from(date);
ZoneId zone = ZoneId.systemDefault();
Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();
return Date.from(instant);