ISO 8601 date format to Unix Time in Java [duplicate]

StackOverflow https://stackoverflow.com/questions/19714018

  •  02-07-2022
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Frage

I have done some Googling and Stacking, but cannot find the necessary resources for any methods that can convert ISO-8601 format to Unix time in Java.

I am parsing NOAA's (National Oceanic Atmospheric Administration) predictions, and using XPath I am able to successfully parse that data. I would, however, like to convert the ISO-8601 i.e. 2013-10-31T14:00:00-07:00 date format to Unix time.

Are there any Java libraries that can do this?

What my code does: 

for (int i = 0; i < tempHourlyResult.getLength(); i++) {
                writer.append(
                        hourlyResult.item(i).getNodeValue() + ","
                        + tempHourlyResult.item(i).getNodeValue()+ "," 
                        + dewPointResult.item(i).getNodeValue() + ","
                        + windSpeedResult.item(i).getNodeValue() +","
                        + relHumResult.item(i).getNodeValue() + "\n");
            }
War es hilfreich?

Lösung

The java.util.Date class store time internally in a format very close to the POSIX time format (it uses milliseconds instead of seconds). So assuming you have your date in a String object called stringDate:

SimpleDateFormat dateParser = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
long dateInMilli = dateParser.parse(stringDate).getTime();
long posixDate = dateInMilli/1000
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