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Create 30 minute intervals from a given date and time

I have time in the format below

2015-10-28T18: 37: 04,899 + 05: 30

I need to create slots in the format below

11.00AM - 12.00PM 28/10/15

12.00PM - 1.00PM 28/10/15

1.00PM - 2.00PM 28/10/15

String timeValue = "2015-10-28T18:37:04.899+05:30"; StringTokenizer stringTokenizer = new StringTokenizer(timeValue,"T"); String dateValue = stringTokenizer.nextElement().toString(); String endDateValue = "2015-10-30"; String restString= stringTokenizer.nextElement().toString(); StringTokenizer secondTokeniser = new StringTokenizer(restString,":"); String hours = secondTokeniser.nextElement().toString(); String minutes = secondTokeniser.nextElement().toString(); hours = String.valueOf(Integer.parseInt(hours) + 2); if (Integer.parseInt(minutes) > 30){ minutes = "00"; }else{ minutes = "30"; } String amOrPm = null; if(Integer.parseInt(hours) < 12){ amOrPm = "AM"; }else{ amOrPm = "PM"; hours = String.valueOf(getHoursValue(Integer.parseInt(hours))); } String time1 = hours + ":" + minutes + " " + amOrPm; String time2 = "12" + ":" + "00" + " AM "; String format = "yyyy-mm-dd hh:mm a"; SimpleDateFormat sdf = new SimpleDateFormat(format); try { Date dateObj1 = sdf.parse(dateValue + " " + time1); Date dateObj2 = sdf.parse(endDateValue + " " + time2); Logger.d(TAG, "Date Start: " + dateObj1); Logger.d(TAG, "Date End: " + dateObj2); long dif = dateObj1.getTime(); while (dif < dateObj2.getTime()) { Date slot = new Date(dif); Log.d(TAG, "Hour slot = " + slot); dif += 1800000; } }catch (ParseException ex){ ex.printStackTrace(); }

In the above code, I get the output below

Wed Jan 28 20:00:00 IST 2015

Wed Jan 28 20:30:00 IST 2015

Wed Jan 28 21:00:00 IST 2015

Wed Jan 28 21:30:00 IST 2015

Wed Jan 28 22:00:00 IST 2015

Wed Jan 28 22:30:00 IST 2015

which is in 24 hours format

I want the bottom format to be placed

11.00AM - 12.00PM 28/10/15

12.00PM - 1.00PM 28/10/15

1.00PM - 2.00PM 28/10/15

Can anyone help me in this regard

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3 answers

You can use the following, note that for a month you use MM instead of MM . I am adding a simple getHoursValue since I do not know yours.

Hope this helps!

 public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); displayTimeSlots(); } private int getHoursValue(int hours){ return hours - 12; } private void displayTimeSlots(){ String timeValue = "2015-10-28T18:37:04.899+05:30"; StringTokenizer stringTokenizer = new StringTokenizer(timeValue,"T"); String dateValue = stringTokenizer.nextElement().toString(); String endDateValue = "2015-10-30"; String restString= stringTokenizer.nextElement().toString(); StringTokenizer secondTokeniser = new StringTokenizer(restString,":"); String hours = secondTokeniser.nextElement().toString(); String minutes = secondTokeniser.nextElement().toString(); hours = String.valueOf(Integer.parseInt(hours) + 2); if (Integer.parseInt(minutes) > 30){ minutes = "00"; }else{ minutes = "30"; } String amOrPm; if(Integer.parseInt(hours) < 12){ amOrPm = "AM"; }else{ amOrPm = "PM"; hours = String.valueOf(getHoursValue(Integer.parseInt(hours))); } String time1 = hours + ":" + minutes + " " + amOrPm; String time2 = "12" + ":" + "00" + " AM "; String format = "yyyy-MM-dd hh:mm a"; SimpleDateFormat sdf = new SimpleDateFormat(format); try { Date dateObj1 = sdf.parse(dateValue + " " + time1); Date dateObj2 = sdf.parse(endDateValue + " " + time2); Log.d("TAG", "Date Start: " + dateObj1); Log.d("TAG", "Date End: " + dateObj2); long dif = dateObj1.getTime(); while (dif < dateObj2.getTime()) { Date slot1 = new Date(dif); dif += 3600000; Date slot2 = new Date(dif); dif += 3600000; SimpleDateFormat sdf1 = new SimpleDateFormat("hh:mm a"); SimpleDateFormat sdf2 = new SimpleDateFormat("hh:mm a, dd/MM/yy"); Log.d("TAG", "Hour slot = " + sdf1.format(slot1) + " - " + sdf2.format(slot2)); } }catch (ParseException ex){ ex.printStackTrace(); } } }

Here is logcat:

 11-07 14:54:02.506 24299-24299/? D/TAG: Date Start: Wed Oct 28 20:00:00 GMT+07:00 2015 11-07 14:54:02.506 24299-24299/? D/TAG: Date End: Fri Oct 30 00:00:00 GMT+07:00 2015 11-07 14:54:02.506 24299-24299/? D/TAG: Hour slot = 08:00 PM - 09:00 PM, 28/10/15 11-07 14:54:02.506 24299-24299/? D/TAG: Hour slot = 10:00 PM - 11:00 PM, 28/10/15 11-07 14:54:02.506 24299-24299/? D/TAG: Hour slot = 12:00 AM - 01:00 AM, 29/10/15 11-07 14:54:02.506 24299-24299/? D/TAG: Hour slot = 02:00 AM - 03:00 AM, 29/10/15 11-07 14:54:02.506 24299-24299/? D/TAG: Hour slot = 04:00 AM - 05:00 AM, 29/10/15 11-07 14:54:02.506 24299-24299/? D/TAG: Hour slot = 06:00 AM - 07:00 AM, 29/10/15 11-07 14:54:02.506 24299-24299/? D/TAG: Hour slot = 08:00 AM - 09:00 AM, 29/10/15 11-07 14:54:02.527 24299-24299/? D/TAG: Hour slot = 10:00 AM - 11:00 AM, 29/10/15 11-07 14:54:02.537 24299-24299/? D/TAG: Hour slot = 12:00 PM - 01:00 PM, 29/10/15 11-07 14:54:02.537 24299-24299/com.example.timeslots D/TAG: Hour slot = 02:00 PM - 03:00 PM, 29/10/15 11-07 14:54:02.556 24299-24299/com.example.timeslots D/TAG: Hour slot = 04:00 PM - 05:00 PM, 29/10/15 11-07 14:54:02.566 24299-24299/com.example.timeslots D/TAG: Hour slot = 06:00 PM - 07:00 PM, 29/10/15 11-07 14:54:02.566 24299-24299/com.example.timeslots D/TAG: Hour slot = 08:00 PM - 09:00 PM, 29/10/15 11-07 14:54:02.566 24299-24299/com.example.timeslots D/TAG: Hour slot = 10:00 PM - 11:00 PM, 29/10/15
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I think this is what you are looking for:

 String timeValue = "2015-10-28T18:37:04.899+05:30"; SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS"); try { Calendar startCalendar = Calendar.getInstance(); startCalendar.setTime(sdf.parse(timeValue)); if (startCalendar.get(Calendar.MINUTE) < 30) { startCalendar.set(Calendar.MINUTE, 30); } else { startCalendar.add(Calendar.MINUTE, 30); // overstep hour and clear minutes startCalendar.clear(Calendar.MINUTE); } Calendar endCalendar = Calendar.getInstance(); endCalendar.setTime(startCalendar.getTime()); // if you want dates for whole next day, uncomment next line //endCalendar.add(Calendar.DAY_OF_YEAR, 1); endCalendar.add(Calendar.HOUR_OF_DAY, 24 - startCalendar.get(Calendar.HOUR_OF_DAY)); endCalendar.clear(Calendar.MINUTE); endCalendar.clear(Calendar.SECOND); endCalendar.clear(Calendar.MILLISECOND); SimpleDateFormat slotTime = new SimpleDateFormat("hh:mma"); SimpleDateFormat slotDate = new SimpleDateFormat(", dd/MM/yy"); while (endCalendar.after(startCalendar)) { String slotStartTime = slotTime.format(startCalendar.getTime()); String slotStartDate = slotDate.format(startCalendar.getTime()); startCalendar.add(Calendar.MINUTE, 30); String slotEndTime = slotTime.format(startCalendar.getTime()); Log.d("DATE", slotStartTime + " - " + slotEndTime + slotStartDate); } } catch (ParseException e) { // date in wrong format }

I need to note that this code ignores the time zone, but it seems you do not need it. Output Example:

 cz.skywall.stack D/DATE: 07:00PM - 07:30PM, 28/10/15 cz.skywall.stack D/DATE: 07:30PM - 08:00PM, 28/10/15 cz.skywall.stack D/DATE: 08:00PM - 08:30PM, 28/10/15 cz.skywall.stack D/DATE: 08:30PM - 09:00PM, 28/10/15 cz.skywall.stack D/DATE: 09:00PM - 09:30PM, 28/10/15 cz.skywall.stack D/DATE: 09:30PM - 10:00PM, 28/10/15 cz.skywall.stack D/DATE: 10:00PM - 10:30PM, 28/10/15 cz.skywall.stack D/DATE: 10:30PM - 11:00PM, 28/10/15 cz.skywall.stack D/DATE: 11:00PM - 11:30PM, 28/10/15 cz.skywall.stack D/DATE: 11:30PM - 12:00AM, 28/10/15

As I mentioned in the code, you can generate slots for the whole next day using the line uncommenting endCalendar.add(Calendar.DAY_OF_YEAR, 1); .

+5
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you can get your first time interval and similar, you can find the other two remaining time intervals.

 String time ="2015-10-28T18:37:04.899+05:30"; try { Date d= new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ").parse(time); SimpleDateFormat dateFormat1=new SimpleDateFormat("hh:mm aaa dd/MM/yy"); String date =dateFormat1.format( d); Calendar calendar = Calendar.getInstance(); calendar.setTime(dateFormat1.parse(date)); calendar.add(Calendar.HOUR, 1); String one=dateFormat1.format(calendar.getTime()); String[] strings=date.split(" "); one=(strings[0]+strings[1]+"-"+one); System.out.println("Time here "+one); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); }
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Source: https://habr.com/ru/post/1234766/

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