Date conversion: error with time

Question

I got a date from server in the form E, dd MMM yyyy HH:mm:ss Z where timezone is +0200

I parse it in my own format yyyy-MM-dd HH:mm:ss using

myFormat.format(serverFormat.parse(dateString));

and I get time wrong: it's one hour before. So, if I get 10:00 in conversion I get 09:00 . Why?

Answer 1

I believe that the problem here is DST - Daylight saving time. The standard is winter time. It is a summer now, so you get 1 hour difference. You are using timezone shift syntax +0200 that does not and cannot support daylight saving because it depends on country.

You should use locale specific syntax of time zone definition, eg Europe/Amsterdam instead of +0100 . In addition take a look on API of class TimeZone :

• inDaylightTime(Date date)
• useDaylightTime()

Answer 2

Check the timezone of the returned value which most probably is the cause of the issue.

DateFormat formatter = new SimpleDateFormat("dd MMM yyyy HH:mm:ss z");    
formatter.setTimeZone(TimeZone.getTimeZone("GMT+2")); 

System.out.println( formatter.format(serverFormat.parse(dateString));

Answer 3

试试吧

formatter = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss Z");