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androidsimpledateformatutcdatetime-parsing
Saef Myth
Saef Myth

Reputation: 297

Parsing datetime to UTC

I have this date => 2017-10-17 10:23:30 UTC TIME

I'm parsing it like this 

    private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
    TimeZone tz = TimeZone.getDefault(); // +03:00
    dateFormat.setTimeZone(tz);

    Date parsed_date = dateFormat.parse("2017-10-17 10:23:30");

but this gives me this

Tue Oct 17 13:23:30 GMT+03:00 2017

I want this

2017-10-17 01:23:30

What's the problem?

Upvotes: 0

Views: 1049

Answers (2)

Saef Myth
Saef Myth

Reputation: 297

Thank you guys for your help that's what i wonted i turn out that if the date in UTC you should start with parsing in the utc format that will keep the date as its the for formating it to your local timezone format it with local time zone 

   private String getDate(String dateString) {
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
            formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
            Date value = null;
            try {
                value = formatter.parse(dateString);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            SimpleDateFormat dateFormatter = new SimpleDateFormat("hh:mm aa");
            dateFormatter.setTimeZone(TimeZone.getDefault());
            String dt = dateFormatter.format(value);

            return dt;
        }

Upvotes: 1

Henry
Henry

Reputation: 43738

A Date does not have a time zone. So your parsing works since Tue Oct 17 13:23:30 GMT+03:00 2017 is the same point in time as 2017-10-17 10:23:30 UTC.

The time zone is only added when you try to print a date. For example:

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));

Date parsed_date= dateFormat.parse("2017-10-17 10:23:30");
String strDate = dateFormat.format(parsed_date);
System.out.println(strDate);

prints:

2017-10-17 10:23:30

Update: to show a date in another format / time-zone you can use something like this:

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));

Date parsed_date= dateFormat.parse("2017-10-17 10:23:30");

SimpleDateFormat printFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
printFormat.setTimeZone(TimeZone.getTimeZone("GMT+3"));
String strDate = printFormat.format(parsed_date);
System.out.println(strDate);

This prints:

2017-10-17 01:23:30

Upvotes: 0

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