Convert timestamp with offset to UTC

Conversion

I have a timestamp with an offset (-6) in the following format:

2019-11-30T00:01:00.000-06:00

and I want to convert it to an UTC timestamp, like:

2019-11-30T06:01:00.000Z

Attempt

I tried it the following way:

String text = "2019-11-30T00:01:00.000-06:00";

LocalDate date = LocalDate.parse(text, DateTimeFormatter.BASIC_ISO_DATE);

System.out.println(date.toInstant());

but it is not compiling:

The method toInstant() is undefined for the type LocalDate

How am I supposed to do this correctly?

tl;dr

String text = "2019-11-30T00:01:00.000-06:00";
OffsetDateTime offsetDateTime = OffsetDateTime.parse(text);
Instant instant = offsetDateTime.toInstant();

System.out.println(instant); // 2019-11-30T06:01:00Z

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
  .withZone(ZoneOffset.UTC);
System.out.println(formatter.format(instant)); // 2019-11-30T06:01:00.000Z

Explanation

Your date is not just a date, it also has time. So LocalDate would not work. If at all, then LocalDateTime.

But, it is also not a local date/time, it has offset information. You need to use OffsetDateTime instead, and then go to Instant from there.

To actually get the desired output for your Instant, you also have to create a proper DateTimeFormatter, since the default representation does not include the millis.