DateFormat.parse

Hi all,
I am trying to parse some Strings into date objects, but i'm getting some strange output.
The dates (Strings) that go into my program are:
2005/3/08 09:12:38
2005/3/10 17:29:57
2005/3/11 15:39:59
2005/3/23 13:30:03
2005/3/23 13:32:49
my code should take these strings, parse them into dates, add them to a List and sort the list. But the output i get is:
Mon Aug 26 09:12:00 BST 2013
Wed Aug 26 17:29:00 BST 2015
Thu Aug 25 15:39:00 BST 2016
Fri Aug 25 13:30:00 BST 2028
Fri Aug 25 13:32:00 BST 2028
as u can see - these are not the strings i entered originally. the code i am using is:
public java.util.Date dateConverter(String dateString) throws Exception
{     int intMonth = 99;
     String [] months = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
          String month = dateString.substring(4,7);
     for (int i = 0 ; i < 12 ; i++)
     {     if (months[i].equals(month))
          {     intMonth = i+1;
     dateString = dateString.substring(24,28) + "/" + intMonth + "/" + dateString.substring(8,10) + " " + dateString.substring(10,20);
     java.util.Date newDate = dateFormat.parse(dateString);
     return newDate;
can anyone tell me whats missing from my code, and how i can get the correct output.
thanks

What happens if you do this? dateString = dateString.substring(24,28) + "/" + intMonth + "/" + dateString.substring(8,10) + " " + dateString.substring(10,20);
java.util.Date newDate =dateFormat.parse(dateString);
System.out.println("Parsing string " + dateString + " into date " + newDate);

Similar Messages

DateFormat parse validation

This didn't seem to show up first time so I'll try again.
The docs and tutorials indicate that DateFormat.parse should thorw an error if an invalid date is provided. However, the following throws no error:
SimpleDateFormat formatter_mmddyy = new SimpleDateFormat ("MM/dd/yy");
Date theDate = formatter_mmddyy.parse("13/22/05");
What is the correct way to validate dates?
-- Frank

Depending on how strict you want your validation to be you can either:
a) leave it as is and let it adjust as it sees fit (rolling forward if you try something like you just did)
b) Call setLenient(false) to make it not do that, but allow extraneous cahracters at the end (so Strings like "12/22/05yasureyoubetcha" still come out valid)
c) use the version of parse that takes a ParsePosition and manually verify that the passed in ParsePosition does not indicate an error and shows that the whole String was consumed during parsing.
That's my take on it anyway
Good Luck
Lee

DateFormat.parse() reads 12:00:00 as 00:00:00?

Hi, i have a method, which uses DateFormat.parse() function, and i want to check whether a date and time input is valid. as you can see from the following code; i have defined the format as (dd-mm-yyyy at hh:mm:ss). the problem is, if i pass a string as (dd-mm-yyyy at 12:21:23), the method changes hour field to '00'. i.e., the line denoted as LINE N in the code prints out 'dd-mm-yyyy at 00:21:23'. i have tested other hours and they are all fine, 00 is interpreted as 00, 24 is 00 which is fine, but 12 is also parsed to 00.... any way to change this please?
Many thanks!
public boolean isValidDate(String dt)
        boolean isValid=false;
        DateFormat datef=new SimpleDateFormat("dd-MM-yyyy 'at' hh:mm:ss",Locale.UK);
        java.util.Date d = new java.util.Date();
        try{
            d=datef.parse(dt);
            ////////////////////// LINE N //////////////////////////////////////////
            System.out.println("is this right"+d.toString());
            ///////////////////// LINE N //////////////////////////////////////////
            int hr = d.getHours();
            System.out.println("This is the hour "+hr);
            if(hr<=18&&hr>=9)
                isValid=true;
                System.out.println("hour ok");
            else{System.out.println("hour not ok");}
        catch(ParseException pe)
            isValid=false;
        return isValid;
    }

use gregoriancalendar instead
-->
http://java.sun.com/j2se/1.4.2/docs/api/java/util/Greg
orianCalendar.htmlTrue.
@OP. You should never call getHours() on a date object, you should always use a Calendar.
Kaj

Is is possible to allow multiple date format strings pass DateFormat.parse?

I'm trying to use DateFormat.parse to validate a date in the 20/12/08 format. I would like to allow users to input 20-12-08 or 20 12 08.
The code currently looks like this:
formatter = DateFormat.getDateInstance(DateFormat.SMALL, US);It is currently throwing an exception if 10-12-08 is sent in where as 10/12/08 works just fine.
Is there a alternate us locale that is more lenient?
setLenient(true) didn't solve the problem for me. I think that would accept 32/12/08 not 10-12-08.
I could parse the date string and replace - or ' ' with a /.. Is that best practice?
What other options do I have? Could I use SimpleDateFormat somehow?
Thanks for the input

That just doesn't seem clean. It will work, but I would rather not have a valid application flow use an exception to get its job done.
The application is also international, so many locales on one format is valid. The US user base seems to think they can type in the date however they want. So passed into the method is the locale, I would have to modify a lot of code to send in a list of valid locales.
The best solution for me would be to have a locale that would allow - or ' ' or /. That way I still only have to make one call to df.parse and an exception produces an invalid date message. Is that possible?
Thanks

DateFormat parsing problem

Hi,
A little limitation I have discovered in DateFormat.
I'm using SimpleDateFormat, and I supply the format "HH:mm"
I expect the DateFormat parsing to fail when calling parse() for Strings such as "12:13:13", since in the format there is no seconds-resolution.
Instead, the parsing runs without exception and returns the time 12:13:00 (The seconds are truncated).
Is thyere a way to make the DateFormat to fail and throw an exception in such a scenario?
Thanks,
Miki

I doubt it. Also, if you enter an invalid date such as Dec 34 2004, it may (or may not) return an invalid date such as something like Aug 23 1834 rather than throw an exception. I think its best to pass the string to a validate format class that you custom write to check the format (such as xx:xx:xx), and also a validate date class (after passing the validate format) that you custom write to see if its a valid date (such as Dec 34, or if Feb 29, 2003 really is a leap year).
Actually, I dont even use the classes such as DateFormat class directly in my code. Instead, I have a custom class with a host of static functions (containing DateFormat) to do all kinds of date/timestamp/string convertions to deal with dates. My code uses that class instead.

DateFormat parse method usage

Hi all,
I am using the following code to parse the date String object to Date Object -
======================================================================
if(dateString == null || dateString.trim().equals(""))
return null;
DateFormat dateFormatter = DateFormat.getDateInstance(DateFormat.SHORT,
Locale.getDefault());
Date d = null;
try
dateFormatter.setLenient(false);
d = dateFormatter.parse(dateString);
catch(ParseException pe)
e.printStackTrace();
=================================================================
This code works perfectly for all formats of String objects I give except for the format - "12/12/12/1" in which case it converts to following date object -
"Wed Dec 12 00:00:00 IST 2012" although its an invalid date String.
Please let me know how I could have correct validation done in such cases or if this is the right behavior for DateFormat class.
Thanks in advance!!

I'm not going to comment on how exactly the parse method does its business, but I can suggest you use a regex pattern to validate the input you will send the parse method.
Here is some info from the CodeProject website on date validation(Note that this is aimed at .NET - but regex works the same in Java as it does in .NET [i think]):
Dates: As with numbers, we need two validators: a key-press validator, and a completion validator. The key-press validator can be pretty simple, if we limit how our user enters the date. Lets say that we want to validate for the U.S. date format mm/dd/yyyy. Here is a validator that will do that:
^([0-9]|/)*$
The regex reads: Match any string that contains a sequence of zero or more characters, where each character is either a digit or a slash. This validator will give the user immediate feedback if they enter an invalid character, such as an a.
Copy that regex to Regex Tester and give it a try. Note that the validation fails if the user enters dashes, instead of slashes, between the parts of the date. How could we increase the flexibility of our regex to accommodate dashes? Think about the question for a minute before moving on.
All we need to do is add a dash to the alternates group:
^([0-9]|/|-)*$
We could add other alternates to make the regex as flexible as it needs to be.
The completion validator does a final check to determine whether the input matches a complete date pattern:
^[0-2]?[1-9](/|-)[0-3]?[0-9](/|-)[1-2][0-9][0-9][0-9]$
The regex reads as follows: "Match any string that conforms to this pattern: The first character can be a 0, 1, or 2, and it may be omitted. The second character can be any number and is required. The next character can be a slash or a dash, and is required And so on. This regex differs from the ones we used before in that it specifies each character of the patternthe pattern is more of a template than a formula.
Note the first character of the regex: [0-2]. This character points out that we can limit allowable digits to less than the full set. We can also expand them; for example, [0-9A-F] would allow any hexadecimal digit. In fact, we can use this structure, known as a character class, to specify any set of characters we want. For example, the character class [A-Z] allows capital letters, and [A-Za-z] allows upper or lower-case letters.
Our date regex also points out some of the limitations of regex validation. Paste the date regex shown into Regex Tester and try out some dates. The regex does a pretty good job with run-of-the-mill dates, but it allows some patently invalid ones, such as 29/29/2006, or 12/39/2006'. The regex is clearly not bulletproof.
We could beef up the regular expression with additional features to catch these invalid dates, but it may be simpler to simply use a bit of .NET in the completion validator:
bool isValid = DateTime.TryParse(dateString, out dummy);
We gain the additional benefit that .NET will check the date for leap year validity, and so on. As always, the choice comes down to: What is simpler? What is faster? What is more easily understood? In my shop, we use a regex for the key-press validator, and DateTime.TryParse() for the completion validator.
Oh - and there is another regex validator:
^[0-9]{4}-(((0[13578]|(10|12))-(0[1-9]|[1-2][0-9]|3[0-1]))|(02-(0[1-9]|[1-2][0-9]))|((0[469]|11)-(0[1-9]|[1-2][0-9]|30)))$
which matches the yyyy-mm-dd date format and also validates month and number of days in a month. Could be improved as currently all leap year dates (yyyy-02-29) will validate.
Sorry if I couldn't be of more help...
Edited by: JoKiLlSyA on Oct 9, 2008 11:22 PM

DateFormat.parse(String)

can anybody tell me why I don't get a SHORT format:
import java.util.*;
import java.text.*;
public class MyDate{
   public static void main(String[] args){
      Date date = makeDate("04/22/2003");
      System.out.println(date); // what i get looks more like FULL
    public static Date makeDate(String dateString){
       Date date = null;
       try {
          DateFormat fmt = DateFormat.getDateInstance(DateFormat.SHORT);
          date = fmt.parse(dateString);
      catch(ParseException e) {}
      return date;
}Thank you.

what I think is tripping you up is that a java.util.Date is not a String. It looks like you're thinking that you can format a java.util.Date object and somehow it is "11/23/2004" (or whatever) - but it's not - it's just a number. So, you have this String that you want to convert to a java.util.Date (which you correctly did with the parse method of the DateFormat class) but then you turn around and want to convert that java.util.Date to a String so you can put it into a List, so why not just put the original String into your List? Is it because you want to change the format? Fair enough, then you can use two DateFormat implementations, one to parse the incoming String to a Date, then the other to format the Date to the format you want. Or is it so you can do the sort chronologically? If that's the case, then you can write up a Comparator to do that, or you can store Dates in your list, sort them, and when it comes time to display this thing (if you ever do that) use a DateFormat implementation to convert those to a formatted String.
Make sense?

DateFormat parse problem

Hello all,
I'm trying to parse a simple date, using java version 1.4.12, but for some reason an exception is thrown. Here is the code:
DateFormat format = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.SHORT);
Date date = format.parse("Nov 4, 2003 8:14 PM");
Can anyone help?
Thanks

I always use SimpleDateFormat. One thing might be that the parsing pattern returned for your default locale doesn't match your input String.

Problem with DateFormat.parse

hi,
I'm working using Java 1.5.
i'm using SimpleDateFormat to parse date strings. My program has the following piece of code:
Class DateConverter {
SimpleDateFormat m_sdate = null ;
public DateConverter() {
this.m_sdate = new SimpleDateFormat("yyyyMMdd") ;
public Date to_date(String dstr) {
return this.m_sdate.parse(dstr) ;
The date parsing works fine as long as I give dates upto "00010101" but throws java.text.ParseException for the value "00001231". I was just eager to know whether 00010101 is the least date that can be parsed???
Thanks,
Venkatesh

I don't get a ParseException with your code; if there is an earliest date that can be parsed it's not 1/1/1.fmt = new SimpleDateFormat("yyyy/MM/dd");
new SimpleDateFormat("dd.MM.y G").format(fmt.parse("0/12/31"));
output: <31.12.01 BC>

DateFormat

I have a string in the format "07/02/2002". I want to convert it into a date. Here's my code
String myDate = "07/02/2002";
Date date = DateFormat.getDateInstance().parse(myDate);
But I got the below exception
java.text.ParseException: Unparseable date: "07/02/2002"
at java.text.DateFormat.parse(DateFormat.java:312)
Do you have any ideas?

The easiest way to do this is to use java.text.SimpleDateFormat
import java.text.SimpleDateFormat;
import java.util.Date;
// set up the format
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
// parse
Date datToday = sdf.parse("07/02/2002");Hope this helps.

Problem parsing SimpleDateFormat date format to database

I have a page where I am getting parameter values form another page a constucting
a string from these values which i then want to insert into my SQL database.
The field i am putting the data into is of type DATETIME and i am using the SimpleDateFormat to format the string.
Here is my code
String startTime = request.getParameter("startHour") + ":" + request.getParameter("startMin")+ ":00";
     String endTime = request.getParameter("endHour") + ":" + request.getParameter("endMin") + ":00";
     String startDate = request.getParameter("startDay") + "-" + request.getParameter("startMonth") + "-" + request.getParameter("startYear");
     String endDate = request.getParameter("endDay") + "-" + request.getParameter("endMonth") + "-" + request.getParameter("endYear");
     scheduleData.startTime = startTime;
     scheduleData.endTime = endTime;
     scheduleData.startDate = startDate;
     scheduleData.endDate = endDate;
     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     StringBuffer start = new StringBuffer();
     start.append("'"); // start quote (enclose string values in single quote)
     start.append(scheduleData.startDate); // or compose it from the parameter values
     start.append(" "); // add space between date and time
     start.append(scheduleData.startTime); // or compose it from the parameter values
     start.append("'"); // end quote (enclose string values in single quote)
     StringBuffer end = new StringBuffer();
     end.append("'"); // start quote (enclose string values in single quote)
     end.append(scheduleData.endDate); // or compose it from the parameter values
     end.append(" "); // add space between date and time
     end.append(scheduleData.endTime); // or compose it from the parameter values
     end.append("'"); // end quote (enclose string values in single quote)
     Date startSQLDate = new Date();
     startSQLDate = sdf.parse(start.toString());
     Date endSQLDate = new Date();
     endSQLDate = sdf.parse(end.toString());
Driver DriverinsertSchedule   = (Driver)Class.forName(MM_connAdministration_DRIVER).newInstance();
Connection ConninsertSchedule = DriverManager.getConnection(MM_connAdministration_STRING,
                                                            MM_connAdministration_USERNAME,
                                                            MM_connAdministration_PASSWORD);
for (int i = 0; i < scheduleData.participants.length; i++) {
    PreparedStatement insertSchedule =
                          ConninsertSchedule.prepareStatement("INSERT INTO Administration.schedule (Assessment_ID, Participant_ID, Schedule_Name, Restrict_Times, Schedule_Starts, Schedule_Stops, Resrict_Attempts, Max_Attempts) VALUES ( '"
                                                                  + scheduleData.assessmentID + "', '"
                                                                  + scheduleData.participants[i] + "', '"
                                                                  + scheduleData.scheduleName + "', '"
                                                                  + scheduleData.participants[i] + "', '"
                                                                  + scheduleData.scheduleName + "', '"
                                                                  + scheduleData.timeLimit + "', '" + startSQLDate
                                                                  + "', '" + endSQLDate + "', '"
                                                                  + scheduleData.limitAttempts + "', '"
                                                                  + scheduleData.attemptsAllowed + "' ) ");
    insertSchedule.executeUpdate();
}I am getting this error.
javax.servlet.ServletException: Unparseable date: "'01-01-2005 09:00:00'"
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)     org.apache.jsp.administration.schedules.process_005fschedule_jsp._jspService(process_005fschedule_jsp.java:385)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.text.ParseException: Unparseable date: "'01-01-2005 09:00:00'"
java.text.DateFormat.parse(Unknown Source)     org.apache.jsp.administration.schedules.process_005fschedule_jsp._jspService(process_005fschedule_jsp.java:133)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
Can someone please help me as my project deadline is 2morrow and this is a major problem that needs fixing. Can anyone please tell me what i am doing wrong and how to fix the problem.
Help would be much appreciated
Thanks

Can someone please help me as my project deadline ...You can do one of the following.
1. Figure out the exact format for time that your database takes. In the previous thread you posted there was a suggestion about that exact format.
2. Use prepared statements and a java.sql.Timestamp which was also suggested to you in the previous thread you posted.
3. Give up.

Date contructor deprecation : Parsing a String to Date

Hi All,
In Java 1.5 the Date() constructor Date(String s) is deprecated. As per the API Documentation DateFormat.Parse() method is used.
The following code from Java 1.4 version has to be upgraded to Java 1.5.
Existing Code:
Date dDate = new Date(sDate);
Modified Code:
DateFormat df = DateFormat.getDateInstance();
Date dDate = df.parse(sDate);
Here the DateFormat accepts a default formatting style as "Feb 01, 2007" and parses the String.
If the String sDate belongs to any other formatting style such as "01 Feb, 2007" or "01 Feb, 07" the code piece throws unparsable date error.
Please give your thougts on this issue to parse the string of any format..
Thanks,
Rajesh.

Hi All,
In Java 1.5 the Date() constructor Date(String s) is
deprecated. As per the API Documentation
DateFormat.Parse() method is used.
The following code from Java 1.4 version has to be
upgraded to Java 1.5.
Existing Code:
Date dDate = new Date(sDate);
Modified Code:
DateFormat df = DateFormat.getDateInstance();
Date dDate = df.parse(sDate);
Here the DateFormat accepts a default formatting
style as "Feb 01, 2007" and parses the String.
If the String sDate belongs to any other formatting
style such as "01 Feb, 2007" or "01 Feb, 07" the code
piece throws unparsable date error.
Please give your thougts on this issue to parse the
string of any format..You can't. What date is this: "08/04/24"? 8 April, 1924? 4 August, 2024?
>
Thanks,
Rajesh.

SimpleDateFormat.parse() causes Unparsable date exception

I am using SimpleDateFormat to both format and parse date strings. The format is working properly, but parse results in the following exception:
java.text.ParseException: Unparseable date: "2007-08-31T12:05:05.651-0700"
at java.text.DateFormat.parse(Unknown Source)
Here is my code:
SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'kk:mm:ss.SZ");
String dateTime = dateFormatter.format(new Date());
Date test = dateFormatter.parse(dateTime);
For testing purposes, I am formatting a date string, and then passing it right back into parse() and I get the exception.
I am using jre1.5.0_10.
Thank you for your help.
-Karen

You have specified the milliseconds (S) to have a minimum of 1 letter.
From the API:
Number: For formatting, the number of pattern letters is the minimum number of digits, and shorter numbers are zero-padded to this amount. For parsing, the number of pattern letters is ignored unless it's needed to separate two adjacent fields.
If you specify it like this:SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'kk:mm:ss.SSSZ");
// or like this
SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'kk:mm:ss.S Z");it will work.
Message was edited by:
dwg

How to parse system date to return Date and in yyyy-MM-dd format?

DateFormat dateFormat = new SimpleDateFormat ("yyyy-MM-dd");
java.util.Date date = new java.util.Date ();
String dateStr = dateFormat.format (date);
try{
Date date2 = dateFormat.parse (dateStr);
}catch(ParseException pe){
pe.printStackTrace();
Actually, After parsing the date from string, again it is converted into dfault format i.e. 21 Jan 00.00.00 etc...
But I want this parsing date in yyyy-MM-dd format and again to return date.
Can anybody tell me how to do this?

DateFormat dateFormat = new SimpleDateFormat
("yyyy-MM-dd");
java.util.Date date = new java.util.Date ();
String dateStr = dateFormat.format (date);
try{
Date date2 = dateFormat.parse (dateStr);
}catch(ParseException pe){
pe.printStackTrace();
Actually, After parsing the date from string, again
it is converted into dfault format i.e. 21 Jan
00.00.00 etc...
But I want this parsing date in yyyy-MM-dd format and
again to return date.
Can anybody tell me how to do this?A Date object does not have a format, it represents a moment in time. You can use SimpleDateFormat to return a String representing that moment in time in many formats - this does not change the Date object to have that format (which it cannot since it does not contain a format).

Problem with parsing time zones

jdk1.6.0_20
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
     public static void main(String[] args) {
          SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss z");
          try {
               Date date = sdf.parse("20100901 11:51:58 CET");
               String formattedDate = sdf.format(date);
               System.out.println("formattedDate: " + formattedDate);
          } catch (ParseException e) {
               e.printStackTrace();
java.text.ParseException: Unparseable date: "20100901 11:51:58 CET"
     at java.text.DateFormat.parse(Unknown Source)
java.text.ParseException: Unparseable date: "20100901 11:51:58 CEST"
     at java.text.DateFormat.parse(Unknown Source)
Central European Time CET
Central European Summer Time CEST
MEZ and MESZ (the same in German language) works fine.
What is the problem?
For answers I am grateful.

If you want the SimpleDateFormat to use an english language locale instead of the default locale, you should tell it so using the [correct constructor|http://download.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html#SimpleDateFormat(java.lang.String,%20java.util.Locale)] and [appropriate Locale object|http://download.oracle.com/javase/6/docs/api/java/util/Locale.html#ENGLISH].
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss z", Locale.ENGLISH);

DateFormat.parse

Similar Messages

Maybe you are looking for