Number of days from year zero to today

How can I find out the number of days that have passed from the "beginning of time" (0 year, 1 month, 1 day) to today?

Author: Heorhii Lysenko, 2017-05-25
Source

2 answers

The option I found here:

Calendar cal = Calendar.getInstance();
cal.set(0, 1, 1);
long diff = new Date(System.currentTimeMillis() - cal.getTime().getTime();
System.out.println ("Days: " + TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS));

There is a variant with JodaTime:

DateTime date1 = new DateTime(0, 1, 1, 0, 0);
DateTime date2 = new DateTime(System.currentTimeMillis());
int days = Days.daysBetween(date1, date2).getDays();
 0
Author: Vladimir Parfenov, 2017-05-25 11:17:15

Head-on:

int days=System.currentTimeMillis()/(24*60*60*1000L);
 -1
Author: Barmaley, 2017-05-25 12:25:26