Joda-Time

withMillis

public DateTime withMillis(long newMillis)

Returns a copy of this datetime with different millis.

The returned object will be either be a new instance or this. Only the millis will change, the chronology and time zone are kept.

Parameters:

newMillis - the new millis, from 1970-01-01T00:00:00Z

Returns:

a copy of this datetime with different millis

http://www.joda.org/joda-time/