Date parsing different on iOS?

[Gareth Murfin]

this code runs fine on android and emulator  from my test it produces:

"dateTodayS: Fri Aug 31, dayName: Fri monthName: Aug, dayDate: 31, monthNumber:08",

but on real ios it produces:

"dateTodayS: August 31, dayName: Aug monthName: st, dayDate: 1, monthNumber:08",

I realise its just parsing different because of the result from parsing the date, but shouldnt it behave identically on all platforms?

_("DateStringHolder received "+stringDate);

        SimpleDateFormat dateTodaySDF = new SimpleDateFormat("yyyy-MM-dd");

        Date dateToday = null; //a date object representing the string they passed in

        try {

            dateToday   = dateTodaySDF.parse(stringDate);

            String dateTodayS = dateToday.toString();

            dayName    = dateTodayS.substring(0,3);

            monthName  = dateTodayS.substring(4,7);

            dayDate    = dateTodayS.substring(8,10);            

            monthNumber= stringDate.substring(5,7);

            

            //for testing differences on ios and android!

            Dialog.show("ios debug", "dateTodayS:"+dateTodayS+", dayName:"+dayName+", monthName:"+monthName+", dayDate:"+dayDate+", monthNumber:"+monthNumber, "OK", "Cancel");

        }

        catch(Exception e)

        {

            _("**warning** cant parse date! "+e.getMessage()+" ->"+stringDate);

            e.printStackTrace();

        }

[Gareth Murfin]

So yeah I was substringing date.toString, not a good idea. I changed it to be more consistent as shown below, but I still have a weird issue, day of the week seems to be 2 days out:

 int DAY_OF_WEEK = cal.get(java.util.Calendar.DAY_OF_WEEK);

switch(DAY_OF_WEEK)

            {

                case 0: dayName="Mon";break;

                case 1: dayName="Tue";break;

                case 2: dayName="Wed";break;

                case 3: dayName="Thu";break;

                case 4: dayName="Fri";break;

                case 5: dayName="Sat";break;

                case 6: dayName="Sun";break;

            }

tells me aug 31 2018 was sunday, but it was friday?

even if I start at case 1: its still one day out, whats happening? sure ive been thru this so many times.

SimpleDateFormat dateTodaySDF = new SimpleDateFormat("yyyy-MM-dd");

        Date dateToday = null; //a date object representing the string they passed in

        try {

            dateToday   = dateTodaySDF.parse(stringDate);

            _("dateToday -> "+dateToday.toString());

            //do this purely in cn1 so its same on ios and android, no toString stuff on dates

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

            cal.setTime(dateToday); 

            

            int DAY_OF_WEEK = cal.get(java.util.Calendar.DAY_OF_WEEK);

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

            switch(DAY_OF_WEEK)

            {

                case 0: dayName="Mon";break;

                case 1: dayName="Tue";break;

                case 2: dayName="Wed";break;

                case 3: dayName="Thu";break;

                case 4: dayName="Fri";break;

                case 5: dayName="Sat";break;

                case 6: dayName="Sun";break;

            }

            dayDate=""+DAY_OF_MONTH;

            _("DAY_OF_WEEK  ->"+dayName);

            _("DAY_OF_MONTH ->"+DAY_OF_MONTH);

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

            switch(MONTH)

            {

                case 0: monthName="Jan";break;

                case 1: monthName="Feb";break;

                case 2: monthName="Mar";break;

                case 3: monthName="Apr";break;

                case 4: monthName="May";break;

                case 5: monthName="Jun";break;

                case 6: monthName="Jul";break;

                case 7: monthName="Aug";break;

                case 8: monthName="Sep";break;

                case 9: monthName="Oct";break;

                case 10: monthName="Nov";break;

                case 11: monthName="Dec";break;

            }

            _("MONTH ->"+monthName);

            monthNumber=(MONTH+1)+"";

            _("monthNumber-> "+monthNumber);

            _("So the date passed in was: "+dayName+", "+DAY_OF_MONTH+" of "+monthName);

[Gareth Murfin]

im assuming the week begins on a sunday in java, if so all good, i remember seeing that once on my casio watch but never again :)

[Shai Almog]

Are you using the SimpleDateFormat from java.text or com.codename1.l10n?

Use the latter.