Iso date string

[Gareth Murfin]

The api im using requires a string like this:

2018-01-01T15:19:21+00:00

I can build that easy enough in codenameone, all apart from the last bit, for example +00:00, in UK right now its BST so it should be +01:00, so how would I actually produce this stirng in an automated fashion? And for some which works anywhere in the world ? 

Ive written this method but as you can see that bit is hardcoded so api in uk thinks everythign is an hour off, I could hardcode it but then it will need ot change when its back to normal GMT. Im just using UK as an example, I guess the main guestion is how do you get how many hours a time is after or before GMT?

private String getIsoDateString(Date now)

    {

       

        //timePicker.setDate(now); // weird cn1 wont allow this

        java.util.Calendar cal = java.util.Calendar.getInstance();

        String timezone = cal.getTimeZone().getID();

        cal.setTime(now);

       

       int year = cal.get(java.util.Calendar.YEAR);

       int month =cal.get(java.util.Calendar.MONTH)+1;

       int day = cal.get(java.util.Calendar.DAY_OF_MONTH);

       

       String yearS=year+"";

       String monthS=month+"";

       String dayS=day+"";

       if (monthS.length()==1)

       {

           monthS="0"+monthS;

       }

       if (dayS.length()==1)

       {

           dayS="0"+dayS;

       }

       

       String hoursS = cal.get(java.util.Calendar.HOUR_OF_DAY)+"";

       String minS = cal.get(java.util.Calendar.MINUTE)+"";

       String secS = cal.get(java.util.Calendar.SECOND)+"";

       if (hoursS.length()==1)

       {

           hoursS="0"+hoursS;

       }

       if (minS.length()==1)

       {

           minS="0"+minS;

       }

       if (secS.length()==1)

       {

           secS="0"+secS;

       }

       

       //year month day? or yra day month?

        String dateS = yearS+"-"+monthS+"-"+dayS+"T"+hoursS+":"+minS+":"+secS+"+00:00";

        return dateS;

    } 

[Shai Almog]

DateUtil includes the timezone offset value: https://www.codenameone.com/blog/date-util.html

Might be worth adding standard time stamp generation to that class as it's a pretty common use case.