package org.asamk.signal.util; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.TimeZone; public class DateUtils { private static final TimeZone tzUTC = TimeZone.getTimeZone("UTC"); private DateUtils() { } public static String formatTimestamp(long timestamp) { var date = new Date(timestamp); final DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSX"); df.setTimeZone(tzUTC); return timestamp + " (" + df.format(date) + ")"; } }