how to validate a long value is in valid UTC time format

[gita]

a long value is passed in by user (datetimestamp value)

need to validate if it is in a valid UTC format in java

[toadaly]

Every long value represents a valid date/time. But if you need to verify that it is within some range, then I suggest using a java.util.GregorianCalendar.

import java.util.*;
...

Date date = new Date(longMsSinceUnixEpoch);

GregorianCalendar cal = new GregorianCalendar();
cal.setTime(date);


int year = cal.get(Calendar.YEAR);

...etc.
A java.util.Date can be constructed from a long (representing ms since the unix epoch - midnight Jan 1 1970)