获取自Java中的Epoch以来的天数，周数和月数

MutableDateTime epoch = new MutableDateTime();
epoch.setDate(0); //Set to Epoch time
DateTime now = new DateTime();

Days days = Days.daysBetween(epoch, now);
Weeks weeks = Weeks.weeksBetween(epoch, now);
Months months = Months.monthsBetween(epoch, now);

System.out.println(\"Days Since Epoch: \" + days.getDays());
System.out.println(\"Weeks Since Epoch: \" + weeks.getWeeks());
System.out.println(\"Months Since Epoch: \" + months.getMonths());

Days Since Epoch: 15122
Weeks Since Epoch: 2160
Months Since Epoch: 496

LocalDate now = LocalDate.now();
LocalDate epoch = LocalDate.ofEpochDay(0);

System.out.println(\"Days: \" + ChronoUnit.DAYS.between(epoch, now));
System.out.println(\"Weeks: \" + ChronoUnit.WEEKS.between(epoch, now));
System.out.println(\"Months: \" + ChronoUnit.MONTHS.between(epoch, now));

Days: 16857
Weeks: 2408
Months: 553

Long currentMilli = System.currentTimeMillis();
Long seconds = currentMilli / 1000;
Long minutes = seconds / 60;
Long hours = minutes / 60;
Long days = hours / 24;
System.out.println(\"Days since epoch : \"  + days);

System.out.println(\"Days since epoch : \"  + ((int) currentMilli / 86400000));

now

java.time.LocalDate

LocalDate.now().toEpochDay()

Date.getTime()

Calendar now = Calendar.getInstance();
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(0); // start at EPOCH

int days = 0
while (cal.getTimeInMillis() < now.getTimeInMillis()) {
  days += 1
  cal.add(Calendar.DAY_OF_MONTH, 1) // increment one day at a time
}
System.out.println(\"Days since EPOCH = \" + days);

Calendar

Calendar timeSinceEpoch = Calendar.getInstance();
timeSinceEpoch.add(Calendar.YEAR, -1970);

int yearsSinceEpoch = timeSinceEpoch.get(Calendar.YEAR);
int monthsSinceEpoch = timeSinceEpoch.get(Calendar.MONTH) + 12 * yearsSinceEpoch;