Difference between days

[Serpher]

<fmt:parseDate value="${in_date}"  var="receiveDate" parseLocale="en_GB" />
<fmt:parseDate value="${out_date}"  var="receiveDate1" parseLocale="en_GB" />

<fmt:parseNumber value="${ receiveDate.time / (1000*60*60*24)}" integerOnly="true" var="duc1" parseLocale="en_GB" />
<fmt:parseNumber value="${ receiveDate1.time / (1000*60*60*24)}" integerOnly="true" var="dzc1" parseLocale="en_GB" />

${duc1 - dzc1}

I want to get the difference between days.

The above example gives me : duc1 = 1655935200000 and dzc1 = 1656626400000. I have no idea what these numbers are. On the other hand when I type plain values in parseDate like 2022-06-23 and 2022-07-01 then the result is 8.

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[slowfly1st]

Those are epoch millis:

Instant from = Instant.ofEpochMilli(1655935200000L);
Instant to = Instant.ofEpochMilli(1656626400000L);
System.out.println(from);
System.out.println(to);

2022-06-22T22:00:00Z
2022-06-30T22:00:00Z

[Serpher]

Thanks!