Develop Reference

Store date in SQLite

There is a lot of discussion here, but what I have tried isn't working. Till now in my tables I store the dates as a string, but I assume this isn't the right way... So I created a table:
CREATE TABLE "TRANSACTIONS" (
"date" DATETIME,
...
}
I want to store the date like 2016-11-04 10:50, so I use:
String timeStamp = new SimpleDateFormat("yyyy-MM-dd HH:mm").format(Calendar.getInstance().getTime());
I use prepared Statements to insert records in DB and when I try to do this:
stm.setDate(1, timeStamp);
I get that String cannot be converted to Date. So I convert it to DATE
String timeStamp = new SimpleDateFormat("yyyy-MM-dd HH:mm").format(Calendar.getInstance().getTime());
DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm");
Date datee = formatter.parse(timeStamp);
and then I get java.util.Date cannot be converted to java.sql.Date so I tried this:
String timeStamp = new SimpleDateFormat("yyyy-MM-dd HH:mm").format(Calendar.getInstance().getTime());
java.sql.Date sqlDate = java.sql.Date.valueOf(timeStamp);
which when I run it, I get java.lang.IllegalArgumentException

java.sql.Date represents a date, not a date and time.
You are getting this error because you are passing "yyyy-MM-dd HH:mm" and throws java.lang.IllegalArgumentException
String d1 = "2016-10-11";
java.sql.Date d = null ;
d.valueOf(date1);
System.out.println(d.valueOf(date1));
`
This will run without any exception.
For your required format you should use java.sql.Timestamp
String date1 = "2016-10-11 10:45";
SimpleDateFormat sm = new SimpleDateFormat("yyyy-MM-dd HH:mm");
java.util.Date d2 = sm.parse(date1);
Timestamp time = new Timestamp(d2.getTime());
System.out.println(time);
Output - 2016-10-11 10:45:00.0

convert a date object to Oracle timestamp type string

I want to convert a date object, ex: new Date(), to a string which has a format like Oracle's time stamp type, ex: 21-OCT-13 11.08.13.858000000 AM. I know I could just get each piece of information in the date object like day, month, year, hour, minute, ... to form the Oracle format string but I really want to know is there a utility to do that instead?

Using SimpleDateFormat#format() you would print a Date as
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yy hh.mm.ss.SSSSSSSSS a");
System.out.println(sdf.format(new Date()).toUpperCase());
Output :
21-OCT-13 10.01.38.000000614 AM
See JavaDocs for Date and Time patterns.

Try taking a look at SimpleDateFormats - That would be your best bet and easiest way of doing it.
Eg:
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("hh:mm:ss"); //Hours:Minutes:Seconds
String strDate = dateFormat.format(date);

Use SimpleDateFormat.
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("your_format_here"); // dd/MM/yy h:mm:ss a
String formattedDate = sdf.format(date);
System.out.println(formattedDate);

handle date "2012-11-28T06:25:52.085Z"

new to java world.
so want a way to handle date 2012-11-28T06:25:52.085Z so that I can save this in oracle DB. wnat to save in column of type TIMESTAMP
Can someone pls help

Try this:
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.S'Z'");
Date date = df.parse("2012-11-28T06:25:52.085Z");
System.out.println(date);
After parsing the date string to get Date instance, you can store it into the database.

Try This.
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.S'Z'");
String sDate="2012-11-28T06:25:52.085Z";
Date tempDate = sdf.parse(sDate);
Timestamp dateInTimeStamp = new Timestamp(tempDate .getTime());
This will directly give your the TimeStamp Object.

Alternatively, use Joda-time for this purpose:
`DateTimeFormatter dateFormatter = DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss.S'Z');
Timestamp forDatabase = new Timestamp(dateFormatter.parseDateTime(myString).toDate());`

Get time from entire date

I have to get time from entire date
e.g. time=11:00:00 from date 2012-09-01 11:00:00.0
I tried following snippet but getting error Error : Unparseable date: "2012-9-1.13.30. 0. 0"
DateFormat inputFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date date = inputFormat.parse(iResultSet1.getString(i));
DateFormat outputFormat = new SimpleDateFormat("hh:mm:ss");
String outputString = outputFormat.format(date);
Edit: Now I am getting only date instead I want only time
if (iResultSet1.getDate(i) != null) {
Date date = iResultSet1.getDate(i);
System.out.println("date-->" + date);
// Format date into output format
DateFormat outputFormat = new SimpleDateFormat(
"HH:mm:ss");
String outputString = outputFormat.format(date);
// System.out.println("date1-->"+date1);

I wil suggest, in this case rather doing parsing and manipulation in java change your SQL to format and return only date as
Example
SELECT TIME_FORMAT(NOW(), '%H:%i:%s');

You are probably retrieving your date from the database (iResultSet1.getString(i)) and the problem is that you're getting wrong format, i.e. 2012-9-1.13.30. 0. 0. Either change the date format in the database or use:
Date date = iResultSet1.getDate(i);
instead of
DateFormat inputFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date date = inputFormat.parse(iResultSet1.getString(i));

How to format a date String into desirable Date format

I was trying to format a string into date.
For this I have written a code:-
Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
System.out.println(sdf.format( cal.getTime() ));
This is fine..
But now I want to convert a string into a date formatted like above..
For example
String dt="2010-10-22";
And the output should be like this:-
2010-10-22T00:00:00
How do I do this?

String dt = "2010-10-22";
SimpleDateFormat sdfIn = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition ps = new ParsePosition(0)
Date date = sdfIn.parse(dt, pos)
SimpleDateFormat sdfOut = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
System.out.println(sdfOut.format( date ));

This should do it for you, remember to wrap it in a try-catch block just in case.
DateFormat dt = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
try
{
Date today = dt.parse("2010-10-22T00:00:00");
System.out.println("Your Date = " + dt.format(today));
} catch (ParseException e)
{
//This parse operation may not be successful, in which case you should handle the ParseException that gets thrown.
//Black Magic Goes Here
}

If your input is going to be ISO, you could also look at using the Joda Time API, like so:
LocalDateTime localDateTime = new LocalDateTime("2010-10-22");
System.out.println("Formatted time: " + localDateTime.toString());

The same class you use for output formatting of dates can also be used to parse dates on input.
SimpleDateFormat reference
To use your example, to parse the sample date:
String dt = "2010-10-22";
SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd");
System.out.println(dateFormatter.parse(dt));
The fields that are not specified (ie. hour, minutes, etc) will be 0. So your same code can be used to format the date on output.

Date Format Example
Containing the Conversion of String Date object from one format to another