java Date object wrongly calculated -

the following program produces incorrect output:

public class date {   public static void main(string[] args)   {     date d1 = new date(1698526800000l);     date d2 = new date(1698530400000l);     date d3 = new date(1698534000000l);     date d4 = new date(1698537600000l);     system.out.println(d1);     system.out.println(d2);     system.out.println(d3);     system.out.println(d4);   } } 

result:

sun oct 29 00:00:00 idt 2023 sun oct 29 01:00:00 idt 2023 sun oct 29 01:00:00 ist 2023 sun oct 29 02:00:00 ist 2023 

why d2 , d3 produce same date although given different ms value?

edit:

i wanted know why happening, , found out daylight saving time blame on one

although date object has nothing timezone (in java, date represents point in time) when call tostring(), uses platform/system's default timezones , shows date/time accordingly.

if need print dates same time zone can set default timezone program (during app startup) prior printing dates, e.g.:

timezone.setdefault(timezone.gettimezone("utc")); date d1 = new date(1698526800000l); date d2 = new date(1698530400000l); date d3 = new date(1698534000000l); date d4 = new date(1698537600000l); system.out.println(d1); system.out.println(d2); system.out.println(d3); system.out.println(d4); 

the above should print dates utc timezone.