How to get the time zone from a datetime string

Question

How can I get the time zone from a datetime string with this format 2013-08-15T13:00:00-07:00?

Answer 1

You could take the time offset from Andreas answer and use below sinppet to get TimeZone object.

TimeZone tmzo = TimeZone.getTimeZone("GMT"+offset);
System.out.println(tmzo.getID());

Answer 2

if Java 8, you can parse directly with ISO_ZONED_DATE_TIME format

String input = "2013-08-15T13:00:00-07:00";                             
ZonedDateTime zDateTime = ZonedDateTime.parse(input, DateTimeFormatter.ISO_ZONED_DATE_TIME);            
ZoneId zone = zDateTime.getZone();  

Answer 3

In Java 7 you can parse with and without TZ and than calculate the offset, taking your current TZ offset into account.

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
Date withTZ = sdf.parse("2013-08-15T13:00:00-07:00");

SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Date noTZ = sdf2.parse("2013-08-15T13:00:00-07:00");

Answer 4

You can use a regular expression. The following assumes XML dateTime syntax:

String input = "2013-08-15T13:00:00-07:00";
Matcher m = Pattern.compile("(?:[+-]\\d{2}:\\d{2}|Z)$").matcher(input);
if (m.find())
    System.out.println("Time zone: " + m.group());
else
    System.out.println("No time zone found");

Answer 5

2013-08-15T13:00:00-07:00

the last -7:00 means GMT-7 That is MST (Mountain Standard Time)

That timezone is using in US and Canada