Error converting date in Java

String date = jsonobject.getString("needbydate");

String date = jsonobject.getString("needbydate");
DateFormat df = new SimpleDateFormat("MMM/dd/yyyy");
DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ssZ");
Date startDate = sdf.parse(date);
String needbydate = df.format(startDate).toString()+"";

What's up?

>At first

date = 2014-12-17T21：37：00 00:00

>Finally

Needbydate = December 18, 2014

Change 17 to 18 What did I do wrong in the conversion

Edit:

String date=jsonobject.getString("needbydate");
            DateFormat df = new SimpleDateFormat("MMM/dd/yyyy",Locale.ENGLISH);
            DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss",Locale.ENGLISH);
            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
            Date startDate;
            startDate = sdf.parse(date);
            needbydate = df.format(startDate).toString()+"";

Solution

Your date format uses the system default time zone This is OK for your input because it explicitly specifies the UTC offset - but for your output, you just get a date Therefore, it displays the date of that time point in your system time zone

You need to consider the time zone you want - and whether your input is affected by non - zero offset You can use dateformat Settimezone sets the time zone to use when exporting (for example, should 2014-12-17t21:37:00-05:00 be displayed as December 18 (UTC) or December 17 (source time zone)

You should also use HH in the input format instead of HH, because it is obviously a 24-hour value rather than a 12-hour value