Simplest way to get local milliseconds in a time zone with Joda-Time
Currently, to get milliseconds from start of 1970 in a local time zone, I do
long localMillis = dateTime.withZone(timeZone).toLocalDateTime()
.toDateTime(DateTimeZone.UTC).getMillis();
This works, but is there a simpler way to do this?
Answer
You can make this a little clearer by storing a constant LocalDateTime referring to Jan 1, 1970, and then calculating a Duration between that point in time (for a given time zone) and the instant that you care about, like:
private static final LocalDateTime JAN_1_1970 = new LocalDateTime(1970, 1, 1, 0, 0);
...
new Duration(JAN_1_1970.toDateTime(someTimeZone), endPointInstantOrDateTime).getMillis();