UNIX date command options for 8601 dates

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In fact 8601 specifies an entire range of ways to specify dates and times, but if you’re simply after YYYY-MM-DDTHH:MM:SSZ then use:

date -u +%Y-%m-%dT%H:%M:%SZ

UPDATE 12-Sep-2011: While I’m at it, in Java:

DateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
format.setTimeZone(TimeZone.getTimeZone("UTC"));
System.out.println(format.format(new Date()));
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