Develop Reference

android date picker set time

i would like to set the date format of my date picker like this:
yyyy-MM-dd HH:ss:mm
I hope this is the correct format for dates in databases. if not, please tell me which format is right.
also i would like to set the hour,minute and second of selected date like 0
Example:
2015-11-30 00:00:00
For this i use this code:
long dateTime = DatePicker.getCalendarView().getDate();
Date date = new Date(dateTime);
date.setHours(0);
date.setMinutes(0);
date.setSeconds(0);
Android Studio tells me, that setHours,setMinutes and setSeconds is deprecated. what is the new way to set this values?

Use Calendar Object instead of Date:
Calendar c = Calendar.getInstance();
c.setTimeInMillis(DatePicker.getCalendarView().getDate(););
c.set(Calendar.HOUR,00);
like wise

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSSSS'Z'");
String dateString = "2015-11-30 00:00:00";
try {
Date date = df.parse(dateString);
df.applyPattern("yyyy-mm-dd hh:mm:ss");
String result = df.format(date);
}
catch (ParseException e){
e.printStackTrace();
}

Comparison of Date and Time

I have to get count of days which are past to the current day.I have list of days in arraylist.I got the list and I dont know how to compare?Can anyone help me?
This is the code I tried,
private void weeklylogeval(){
int i;
DateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
dateFormatter.setLenient(false);
Date today = new Date();
String s = dateFormatter.format(today);
System.out.println("current date & time new:::"+s);
for(i=0;i<datetime.size();i++){
String daytime=datetime.get(i);
if(today.before(daytime))
}
}
Pls some one help me!

Try this code for date difference manipulation.
String fd=from_date;//date get from mysql database as string.
String td=to_date;//Today's date as string.
if(!fd.equalsIgnoreCase("") && !td.equalsIgnoreCase("")){
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
SimpleDateFormat formatter;
Date frmdt=new Date(fd);
formatter = new SimpleDateFormat("dd/MM/yyyy");
String s1 = formatter.format(frmdt);
Date todt=new Date(td);
String s2 = formatter.format(todt);
Date frmdate = sdf.parse(s1);
Date todate = sdf.parse(s2);
if(frmdate.compareTo(todate)<=0) {
//do your stuff
} else {
// do your stuff
}
}

http://developer.android.com/reference/java/util/Calendar.html
This should be allot easier to use for your purpose
Edit:
Methods you can use:
boolean after(Object calendar)
Returns whether the Date represented by this Calendar instance is after the Date represented by the parameter.
boolean before(Object calendar)
Returns whether the Date represented by this Calendar instance is before the Date represented by the parameter.

Maybe you can construct a Date form the String you get from DB, and then use today.before(daytime) to compare them.
Date daytime = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").parse(datetime.get(i));

Comparing formatted dates

I create a date and then format is like this:
Example 1:
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss dd/MM/yyyy");
String currentDate = sdf.format(new Date());
What I would like to do is check if this date is before another date (also formatted the same way). How would I go about doing this?
Example 2:
Also, how would I check whether one of these is before another:
long setForLong = System.currentTimeMillis() + (totalTime*1000);
String display = (String) DateFormat.format("HH:mm:ss dd/MM/yyyy", setForLong);
EDIT:
I think more detail is needed. I create a date in two different ways for two different uses. The first use just formats the current date into a string so it is readable for the user. In the second case, I am using a date in the future with System.currentTimeMillis and adding on a long. Both result in a string.
Both methods format the date in exactly the same way, and I set the strings into a TextView. Later, I need to compare these dates. I do not have the original data/date/etc, only these strings. Becasue they are formatted in the same way, I though it would be easy to compare them.
I have tried the if(String1.compareTo(String2) >0 ) method, but that does not work if the day is changed.

If you only have two String objects that are dates available to you. You will need to process them in something, either in your own comparator class or in another object. In this case, since these are already formatted into dates, you can just create Date objects and compare using the methods previously posted. Something like this:
String string = "05:30:33 15/02/1985";
Date date1 = new SimpleDateFormat("HH:mm:ss dd/MM/yyyy", Locale.ENGLISH).parse(string);
String string2 = "15:30:33 01/02/1985";
Date date2 = new SimpleDateFormat("HH:mm:ss dd/MM/yyyy", Locale.ENGLISH).parse(string2);
if(date1.getTime()>date2.getTime()) {
//date1 greater than date2
}
else if(date1.getTime()<date2.getTime()) {
//date1 less than date2
}
else {
//date1 equal to date2
}

You should use Calendar for convenient comparing dates.
Calendar c1 = Calendar.getInstance();
c1.setTime(Date someDate);
Calendar c2 = Calendar.getInstance();
c2.setTime(Date anotherDate);
if(c1.before(c2)){
// do something
}
And you can format it at any time
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss dd/MM/yyyy");
String currentDate = sdf.format(c1.getTime());

standard time vs miltary time

Im trying to display the current time in a format like 7:45pm instead of 19:45 but i can't seem to find the right format option.
Time cTime= new Time(Time.getCurrentTimezone());
cTime.setToNow();
clock.setText(cTime.format("%H:%M"));
This seems to display military

You're using Time.format(), so you can refer to the C++ strftime documentation for formatting rules. Your format string should be %I:%M%P for 12-hour time.

Use SimpleDateFormat with a - meaning am/pm marker.
Example:
Calendar cal = Calendar.getInstance();
SimpleDateFormat dateFormat = new SimpleDateFormat("h:mmaa");
try {
String now = dateFormat.format(cal.getTime());
} catch (ParseException e) {
e.printStackTrace();
}

Convert DateTime object java to Json string

I want to convert date time object in java to json string in format as below:
{"date":"/Date(18000000+0000)/"}
I did like this but it didn't give me the format i desired:
JSONObject object = new JSONObject();
object.put("date",new Date());
and the result of object.toString()
{"date":"Fri May 04 11:22:32 GMT+07:00 2012"}
i want the string "Fri May 04 11:22:32 GMT+07:00 2012" transform to "/Date(18000000+0000)/" (18000000+0000 here is just a example).
Thanks for your help.

Here is my solution, although it is not a good way, but I finally find a workable solution.
SimpleDateFormat format = new SimpleDateFormat("Z");
Date date = new Date();
JSONObject object = new JSONObject();
object.put("date", "/Date(" + String.valueOf(date.getTime()) + format.format(date) + ")/");

public static String convertToJsonDateTime(String javaDate)
{
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd HH:mm:ss");
Date currentDate = null;
try {
currentDate = dateFormat.parse(javaDate);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
long time =currentDate.getTime();
return "\\/Date("+time+"+0000)\\/";
}

My solution : I think this is the simplest Way
DateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
yourJsonObject.accumulate("yourDateVarible",dateFormat.format(new Date()));

The date format that you want is /Date(<epoch time><Time Zone>)/.
You can get the epoch time in java using long epoch = System.currentTimeMillis()/1000;(found at this link) and the time zone you can get by using the date and time patteren as Z. Then combine all the strings into one and store it to the Json Object.
Other possibility is that the time you are getting from iOS device may be of the pattern yyMMddHHmmssZ as got from here. Check the output on the iOS device at different times and identify the correct pattern.

From json.org's description of JSONObject:
The values can be any of these types: Boolean, JSONArray, JSONObject, Number, and String, or the JSONObject.NULL object.
This library doesn't support the "complex" mapping of a Date to a JSON representation. You'll have to do it yourself. You may find something like SimpleDateFormat helpful.

If your format like this -> "DDmmYYYY+HHMM"
DD -> Day (2 Digit)
mm -> Month (2 Digit)
YYYY -> Year (4 Digit)
HH -> Hour
MM -> Minute
Than you can do like this:
SimpleDateFormat format = new SimpleDateFormat("DDmmYYYY+HHMM");
JSONObject object = new JSONObject();
object.put("date", "/Date(" + format.format(new Date()) + ")/");

I suppose that's a representation of ISO international date-time format.
YYYYMMDD+HHMM
I think now you will be able to create that string
may be like,
Date d=new Date();
String tmp="";
tmp="/Date("d.getYear()+""+d.getMonth()+""+d.getDate()+"+"+d.getHours()+""+d.getMinutes()+")/";

Upgrade one of the previous answer:
public static String convertToJsonDateTime(Date dateToConvert) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd HH:mm:ss");
long time = dateToConvert.getTime();
return "/Date(" + time + "+0000)/";
}