Develop Reference

How to change hours data from 24-hour format to 12-hour format?

I'm retrieving hours data for places from a service (Factual). It comes to me in 24-hour format and I need to display it in 12-hour format. The data for a specific day comes like this:
"sunday\":[[\"12:00\",\"21:30\"]]
I can successfully retrieve the hours from the JSON. Then, using SimpleDateFormat, I can parse the string to a Date object. But, then I can't figure out how to convert them to 12;-hour format so that I can display them as "12:00 - 9:30" or "12:00pm - 9:30pm" rather than "12:00 - 21:30".
How can I go about doing this? Thanks!
EDIT:
By parsing the string of hours (i.e. "12:00") using SimpleDateFormat sdf2 = new SimpleDateFormat("hh:mm a");, I get an error from JSON saying that the value is unparseable. If I use just SimpleDateFormat sdf2 = new SimpleDateFormat("hh:mm");, then there's no error but I can't get things to show up in 12-hour format.

If you look in the simple date format syntax docs you will find that 'h' is used for 12-hour time and 'a' is used for AM/PM. You will need to extract the two times using substring before putting them through the dateformatters.
http://developer.android.com/reference/java/text/SimpleDateFormat.html
SimpleDateFormat in = new SimpleDateFormat("<input format goes here>");
Date d = in.parse(INPUT_DATE_STRING);
SimpleDateFormat out = new SimpleDateFormat("<output format goes here>");
String outDate = out.format(d);

Try this:
//Char sequence for a 12 hour format.
CharSequence DEFAULT_FORMAT_12_HOUR = "hh:mm a";
//Char sequence for a 24 hour format.
CharSequence DEFAULT_FORMAT_24_HOUR = "kk:mm";
//date is the Date object. Look for more functions in format.
DateFormat.format(DEFAULT_FORMAT_12_HOUR, date);
Let me know if it works. If you have any issue check the Date you are sending.
//This should give you the default time on the device. To show that it works.
DateFormat.format(DEFAULT_FORMAT_12_HOUR, Calendar.getInstance());

/Date(1381363200000)/ to get Simple Date object from this web service reponse?

I have get web service response in my android app in json format. In this response I need to find a date from json. I am getting date "/Date(1381363200000)/" in this format, now to have to convert it to JAVA date object and then get a simple date like : "20-june-2013". I have done some r&d in Google I found about Gson but I be more confused. Please any body tell me how can I achieve this.
Thank you in advance...

The date is in epoch format. All you need to do, is convert it from epoch into a human readable date.
Here's an example of how to do it in Java
Date date = new Date(1381363200000);
DateFormat format = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
String formatted = format.format(date);
System.out.println(formatted);
HTH

Date and time in android

In my appliaction I have to store current date into the database. How can i get the current date and is there is any specific format to store date in database.

Better would be to store the date/time in long in Database and then fetch the long date/time from Database and specify the required format using SimpleDateFormat.

SQLite does not have a storage class set aside for storing dates and/or times. Instead, the built-in Date And Time Functions of SQLite are capable of storing dates and times as TEXT, REAL, or INTEGER values:
TEXT as ISO8601 strings ("YYYY-MM-DD HH:MM:SS.SSS").
REAL as Julian day numbers, the number of days since noon in
Greenwich on November 24, 4714 B.C. according to the proleptic
Gregorian calendar.
INTEGER as Unix Time, the number of seconds since 1970-01-01
00:00:00 UTC.
Applications can chose to store dates and times in any of these formats and freely convert between formats using the built-in date and time functions.
Now for how to insert date in after it.
Use PreparedStatement#setString() or #setLong() respectively.
Hope this explanation works for you..

first convert the date to be stored to a String object using SimpleDateFormat class
code sample:
Date dateToBeStored = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd"); // this format will help you to convert date to 2012/07/04 format string
String dateString = formatter.format(dateToBeStored); // convert string
now read the date string from DB. you should have some means to get the date back from DB.
String readDateStringFromDB = readDate();
Now parse the read date string to date object by parse method of SimpleDateFormat class
Date dateObj = formatter.parse(readDateStringFromDB); // now you have the Date object back

SimpleDateFormat sdfDateTime = new SimpleDateFormat("dd/MM/yyyy"+ "",Locale.US);
String newtime = sdfDateTime.format(new Date(System.currentTimeMillis()));

You can use the Date class to get the epoch time, which could then be stored in the database as an integer. Alternatively you could convert the epoch time to regular time and store it as a date data type.
https://developer.android.com/reference/java/text/SimpleDateFormat

Want to print date&time together in one text field in dd/mm/yyyy hh:mm format in android

I'm a newbie to android and struggling to achieve this.
I want to select date and time and also wants to add the selected date and time in one textfield with this format dd/mm/yyyy hh:mm.
I searched on this but couldn't find what I want to achieve.
any guidelines in terms of code or link would be appreciated.
Thanks

you can use SimpleDateFormat by which you can format the Date.
String format = "dd-MM-yyyy";
SimpleDateFormat sdf = new SimpleDateFormat(format);
System.out.println(sdf.format(yourdate));

use this you can your desired format
String currentDateTimeString = DateFormat.getDateTimeInstance().format(new Date());
like this May 17, 2012 12:03:09 PM

If you need to make Custom Date and Time Picker then you can see how in this they have make.Android Date Slider

How to obtain user date time settings in android

I have a Calendar object, and i know how to format it using android.text.format()
How can i get the phone settings for date and time to format the object to format set by the user. Like 24 hour clock , mmm dd yyyy...

What I wanted was to provide the date and time formatted according to the user's preferences and locale, in separate TextViews.
I have done this using static methods in the DateFormat class:
DateFormat dateFormat = android.text.format.DateFormat.getDateFormat(getApplicationContext()); // Gets system date format
DateFormat timeFormat = android.text.format.DateFormat.getTimeFormat(getApplicationContext()); // Gets system time format
txt1.setText(dateFormat.format(CalendarInstance.getTime())); // format() Returns a string according to the user's preferences (12-hr vs 24-hr) and locale
txt2.setText(timeFormat.format(CalendarInstance.getTime()));

Well, not exactly all the settings (such as 24 vs 12 hour format) selected by the user, but to use the configured locale you can use the DateUtils class.