in src/main/java/org/apache/maven/plugins/resources/MavenBuildTimestamp.java [74:91]
public MavenBuildTimestamp(Date time, String timestampFormat) {
SimpleDateFormat dateFormat;
if (timestampFormat == null) {
dateFormat = new SimpleDateFormat(DEFAULT_BUILD_TIMESTAMP_FORMAT);
} else {
dateFormat = new SimpleDateFormat(timestampFormat);
}
dateFormat.setCalendar(new GregorianCalendar());
dateFormat.setTimeZone(DEFAULT_BUILD_TIME_ZONE);
if (time == null) {
formattedTimestamp = dateFormat.format(new Date());
} else {
formattedTimestamp = dateFormat.format(time);
}
}