datetime 1 « Date Time « Java Data Type Q&A

1. What's the best way to manipulate Dates and Timestamps in Java?

Every time I need to work with date and/or timstamps in Java I always feel like I'm doing something wrong and spend endless hours trying to find a better way of ...

2. Expressing Excel formula in Java (decimal to time interpretation)

I am converting an excel sheet formula to java but I can't understand how excel manages to take the following: 0.22 Applies a formula: =TEXT(R5/14, "h:mm") and somehow arrives at: 0.22 Again if I ...

3. Illegal Date strings in Java

How do I get a DateFormat of some sort to throw an exception if I try to parse an illegal date? If I parse a date like "99.99.9999" with a SimpleDateFormat ...

4. java string to datetime conversion issue

I can't seem to see the problem with the example code below. For some reason seems to be ignoring the year and saying the dates are the same, as can ...

5. How to convert DateTime to Date

How can I convert Date to DateTime and vice versa? E.g.

Date dt = new Date();
Now I want to covert this to DateTime. Also
DateTime dtim = new DateTime();
Now I want to convert it to ...

6. DateTime package

in which package is DateTime defined what i need to import ?

7. Combining java.util.Dates to create a date-time

I have current have two UI components used to specify a date and a time. Both components return java.util.Date instances representing the calendar date and time respectively. My question ...

8. Java 7 Date/Time API

I notice that a snapshot of the Java 7 API has been up on for some time, but I only just had a look through it just now, ...

9. Problem to represent midnight for 01 May 1921 by java.util.Date class

I want to represent midnight by java.util.Date class. To check this I output this value and obtain unexpected result. The code follows:

Calendar calendar = new GregorianCalendar(1921, 4, 1, 0, 0);
Date date2 = calendar.getTime();
I ...

10. Best way to get maximum Date value in java?

I'm writing a bit of logic that requires treating null dates as meaning forever in the future (the date in question is an expiration date, which may or may not exist). ...

11. What's wrong with Java Date & Time API?

Very often I come across negative feedback on Java Date and other date-time-related classes. Being a .NET developer, I cannot fully (without having used them) understand, what's actually wrong with them. ...

12. In Java, how do I get the difference in seconds between 2 dates?

The Java class library has a class named DateTime. DateTime has this method:

int daysBetween(DateTime other)
which returns the number of days between this and the parameter. It doesn't have a method
int secondsBetween(DateTime other)
which ...

13. Equivalent of DateTime.Now in Java?

How do I get the current date in Java? In C# it is DateTime.Now.

14. Java vs c++ types

I've recently had a question about coledatetime java implementation, and Chris said, that the problem might lay in type conversions: cpp-float vs java-float (Or maybe cpp-date vs java-date. Not ...

15. Incorrect Date in Java

I use next code to print current time

    Calendar cal = Calendar.getInstance();
I have Windows XP sp3 istalled. Current time in system tray is 14:30. ...

16. Most idiomatic way to print a time difference in Java?

I'm familiar with printing time difference in milliseconds:

 long time = System.currentTimeMillis();
 //do something that takes some time...
 long completedIn = System.currentTimeMillis() - time;
But, is there a nice way print a ...

17. Why were most java.util.Date methods deprecated?

When you look at the javadoc of the java.util.Date class, most of the methods are deprecated. Why was this done?

18. Converting a date to a time in Java

How can one convert a date type into a time type in Java?

19. Appropriate way to set a duration in Java

What is the appropriate way to set a duration in Java with standard Java libs? Date()? Calendar()? Example? Thanks & Cheers ER

20. "pretty print" duration in java

Does anyone know of a java library that can pretty print a number in milli seconds in the same way that c# does? E.g. 123456 ms as a long would be printed ...

21. How do you subtract Dates in Java?

My heart is bleeding internally after having to go so deep to subtract two dates to calculate the span in number of days:

    GregorianCalendar c1 = new GregorianCalendar();

22. Dates/Calendar in Java

Does java.util.Calendar supports automatic winter/summer time changes?

23. SWT DateTime control used as table editor doesn't extend past bottom of table

I'm having trouble with the SWT DateTime widget. I use DateTime, CCombo, and Text boxes as cell editors. CCombo and DateTime may be (and actually, almost always are) taller ...

24. Simple, concise way to express "tomorrow at 10:30am" using Java standard libraries

Using only standard java 1.5 calls, I'm looking for a concise and simple way to get a java Date object for a specific time, say the next 10:30am that occurs in ...

25. Java equivalent of DateTime.MinValue, DateTime.Today

Is there a Java equivalent of DateTime.MinValue and DateTime.Today in the Java Date class? Or a way of achieving something similar? I've realised how spoilt you are with the .NET datetime class, ...

26. Unexpected results when subtracting dates

Here is the code, for your viewing pleasure:

public static void main(String[] args) throws Exception {
    Calendar cal = Calendar.getInstance();
    cal.set(2010, Calendar.JULY, 10, 1, 0, 20);

27. When will the java date collapse?

AFAIK java stores dates in long variables as milliseconds. Consequently someday there will be no value (cause long has a maximum) which will correspond to the time of that instant. Do ...

28. Intelligent date / time parser for Java

Is there some intelligent date / time parser library for Java? By intelligent I mean, that I don't need to specify the date / time format. The API should be similar ...

29. A bug in Java XMLGregorianCalendar conversion to a Java util.Date?

I'm writing a date/time value to an XML file by reading the date from a RAP based UI as a Java Date object, and passing it as an XMLGregorianCalendar object to ...

30. Java Date oddity

Out of curiosity, why do I receive an IllegalArgumentException for the MONTH in the below test case?

public class Testing {
    public static void main(String args[]) {


31. How to make JsonGenerator pretty-print Date and DateTime values?

I'm using this method to convert any object to a json string:

private String objectToJson(Object object) throws IOException {
        // write JSON

32. How do I get localized date pattern string?

It is quite easy to format and parse Java Date (or Calendar) classes using instance of DateFormat, i.e. I could format current date into short localize date like this:

DateFormat ...

33. What is the best way to get date and time in Clojure?

I need to log some events on a Clojure Client-Server scenario, it seems to me that Clojure does not provide a date/time function. Can any one confirm this or I am ...

34. Is there a partials-capable modern natural language date parser for Java?

I've got two problems and I wonder if I can solve them in one go. I'm trying to do natural language date parsing in Java (well, Scala) and have been using ...

35. How to convert this datetime string into a Java date variable?

Sun Jan 09 2011 22:00:00 GMT+0000 (GMT Standard Time)
I have the above string coming from JavaScript. How do I convert that into a Java DateTime?

36. Convert string to date

I have string of format 01-Jan-11 and I need to parse it to a Date in the format of 01-Jan-11. Problem is when I try to do that always I got out ...

37. ColdFusion Paypal Recurring Payments - CalendarDeserializer giving Invalid date/time

I'm attempting to utilize Paypal Website Payments Pro Recurring Payments system. However, the return coming back from Paypal seems to be missing some data, and is throwing the following: java.lang.NumberFormatException: Invalid ...

38. Next dates using java

How can I calculate next dates using Java? For example, if the user gives me the current date in a field like 2011-02-21, then I want to give back the same day ...

39. Human friendly date logic library in java

So a question, is there a library out there that will allow me to do some datetime logic in human friendly format? For example, if I want to check if given ...

40. Concise way of getting date from

I'm trying to retrieve the date only from a I know I can set the time to 0 but I'm searching for a cleaner, more concise way if possible. Does ...

41. Java dates problem

I'd like to ask a question. I have a list which contains Dates, for example: Fri Jan 07 00:00:00 CET 2011
Fri Jan 07 00:01:00 CET 2011
Fri Jan 07 00:03:00 CET ...

42. Get BIOS Time in Java

Is there a way in Java to get the BIOS date and time? Does Java use the BIOS Datetime when you call java.util.Calendar.getInstance() or new java.util.Date()? I do know that Java somehow works ...

43. Convertion of DateTimeFormat in java!

I just need a small help regarding the DateTime format in java.I am writing a simple chat application based on yahoo messanger,in which I will read the packet of yahoo messanger ...

44. Decrement a date in Java

I want to get the previous day (24 hours) from the current time. e.g if current time is Date currentTime = new Date();

2011-04-25 12:15:31:562 GMT
How to determine time i.e

45. JAVA Date Conversion

How can I convert

Wed Apr 27 17:53:48 PKT 2011
Apr 27, 2011 5:53:48 PM.

46. Convert IST to PST in java

Hi I have a date/Time field i want to get Convert current IST to CURRENT PST in java... need help.... ex: now in IST its :13/may/2011 ...

47. Turn ISO 8601 date/time into "x minutes ago" type of string

So I have an ISO 8601 date/time stamp like "2011-04-21T17:07:50-07:00", and I would like to convert it to say something like "23 minutes ago" or something of that sort. Is there ...

48. Internationalisation of DateTime

I am using joda DateTime for all the date and time manipulation in my web project. There is some scheduling and task specific implementation. I am trying to make this project ...

49. How to convert java date without Z to a date with Z

I have the following date value 1995-12-31T23:59:59 but in order to parse this for a solr query I need it in the below format 1995-12-31T23:59:59Z How can I parse this to get the added ...

50. How come new Date(0L) doesn't return zero date

Date date = new Date(0L);
Shouldn't it give me a zero date? Like 00/00/0000? Gives me Wed Dec 31 19:00:00 EST 1969

51. Date/Time in java

Possible Duplicate:
how to convert java string to Date object
I have a form in which I insert a time in the form of : 10:19 ...

52. DateUtils.parseDate exception

I can't seem to get this to work, it says Unknown pattern character - "T" Unable to parse the date 2011-07-22T12:01:34.9455820

Date theDate = DateUtils.parseDate(notif.dateStr, new String[]{"yyyy-MM-ddTHH:mm:ss.S"});
This won't work either(which is what I ...

53. Convert Apple's Cocoa framework Epoch (reference_date) to Java Date

an iPhone client send a date to a Java server as Apple's Cocoa framework Epoch (which the ms since 2001) and when you converted to java date (since 1970) it convert ...

55. need hep for SWT DateTime in Java

i Bring the Date From the database using the ResultSet rsExpid.

Date joindate =rsExpid.getDate("join_date_ad");
int year = joindate.getYear();
int month =joindate.getMonth();
int day = joindate.getDay();
dateTimeJoin4.setDate(year, month, day);
when i Print the date in the console it ...

56. Problem with DateTime in Java

i have used the Swt DateTime. But I get the problem that we cannot send null value through it. it is always declared. So i used the nebulla dateChooserCombo. it's a ...

57. Clock in dashboard changes as the system time is changed

My requirement is, the clock in the display should not change wen i change the client time of the system. I have the jboss server..There is the dashboard that should display the ...

58. Regarding formate date/time in java

I have two datetime formats,

  1. 'dd-mm-yyyy' and
  2. 'dd-mm-yyyy hh:MM:ss'
in my application. The input value may be a string in any of above forms. I want to store this date value in database. So, ...

59. String to a HH:mm:ss time and finding the difference between 2 times

public static void stringToDate(String time, String time2) {
   try { 
       DateFormat formatter = new SimpleDateFormat("HH:mm:ss");
       Date ...

60. How can I convert epoch time to date and time in Java?

I need to convert epoch timestamp to date and time. I have used the following code to convert but it converts to a wrong date, year and time.

String date = new SimpleDateFormat("MM/dd/yyyy ...

63. Joda DateTime

64. DateTime

65. JiBXException : Missing 'T' separator in dateTime

HI, I need to parse date value from the xml file. pls see the below date value mention in xml file. I had tried change type as String and date, still I'm facing the same exception. can anyboby suggest, how to parse date value into java object. would be great help. Thanks, Raju

66. Getting the Time Portion of DateTime

In my class that gets remote data I am getting a field as such 2008-08-25 06:58:00.0(incoming date/time) 2008-08-25 17:50:00.0(outgoing date/time) I will store the time value in an array( in and out). and also the calculated time between both. How do I get time portion only and also calculate? Below is for reference only! I need to show this above data ...

67. How to check if date/time was entered?

68. Date/Time display problem

I am having a problem displaying small time periods using the Date class. I'm quite new to Java (and this forum) so i'm hoping there is an easy way around this that i just haven't learned yet. Here goes: This code has been tested on Windows NT 2K and XP with the same results. I am trying to display a time ...

69. help with DateTime overflow exception- please!!!!!!

I have written the following code for getting a day, month year and time from a form and inserting this into a table in Access, but always get the errorjava.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]Datetime field overflow (null) Also how would I get this code to update a table which already has the date and time inserted into it? Thanks for your ...

70. convert datetime from EST to PST

I need to convert a date time from EST to PST time. ex: 3/24/2004 09:00:00 -> 3/24/2004 06:00:00 I thought I could just subtract 3 hours and be done but the date could change after subtracting 3 hours from 1AM (01:00:00) and that threw in another problem... Are any classes I that do something similiar to what I need? Any examples ...

71. Date/Time Retrieval

Hi, Not sure if this is the right place to ask this, but I thought I'd try! When running on the AS400, can anyone tell me where the cal.get function picks up the date/time from? I have a suspicion that it is picking it up wrongly, but I'm not sure... Cheers, Richard

72. Date/Time class...?

New question... how can I retrieve the computer's current date/time. I want to do this to ensure completely random numbers when generating random numbers (i.e. running through 'n' number of random numbers where 'n' = day*month*year/seconds*minutes/hour or something similar. Also, is there an easier way to get a completely random number? Is there any way to randomize the seed #? Let ...

74. Java Datetime issue

75. Creating a String from DateTime

76. Subtract Minutes from a DateTime object

77. Convert DateTime Error

78. Problem with a date/time value

I have a computer program that receives an XML file from a client and one of things in that XML file is a value for the date/time. There was a situation where I received an XML file from a client and this was the value for the date/time: 2008-09-17T02:00:00-04:00, which means September 17, 2008 2:00am Eastern Standard Time. My computer program ...


hi... need some idea or sample codes on this issue fromActivityDate/Time : 2009-03-13 08:07:00.0 toActivityDate/Time : 2009-03-14 12:33:00.0 from this Date/Time.. how can i fine the total minute from the From and to Date/Time? at least give me the logic how it work... i been "googeling" over the net..i cant find something similar ... i know it sound easy but i ...

80. Date and Datetime creation from a String.

hello fellows. I hope you are all in good mood today! because I need some help from you guys. thats the problem: I have (coming from an XML file) this String "2008-06-06 10:23:27.14" and this string: "2008-06-06" right? so, I need to create Datatime and Data objects from this string. I tryed to split the string, having 6 Strings, representing year, ...

82. Convert datetime value to EST

83. Trying to find a way to run a class on specific date/time

I want to make one shell task with java servlet that my class will Check user expiration date if this is expired then it will start sending 5 different steps messages before 5 weeks i.e. each step message in every week to remind him for renewal Kindly help me to know how I set some trigger type thing to run this ...

85. getting datetime from Long

I have a value from microsoft AD that is in long type. its 'Pwdlastset' prop from a user account. I want to convert that long value to a date time format I can do it in .net but am having some issues in java. Dim dte As DateTime = DateTime.FromFileTime(129302415104133724) Console.WriteLine(dte.ToString("MM/dd/yyyy hh:mm")) In .net that long value will result in: 09/29/2010 ...

86. how to print the from and to datetime

this is our code Java Code: package tcplistener; import java.sql.Connection; import java.sql.Date; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Timestamp; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.HashSet; import java.util.Set; import java.util.logging.Level; import java.util.logging.Logger; import javax.naming.NamingException; import java.util.Map; import java.util.HashMap; public class Speedfinal { private static PreparedStatement preparedStatement; private static ResultSet rs; private static ResultSet rss; public static void ...

87. what is java free datetime picker

88. datetime??

89. Find difference of date/time between two values in minutes...

I have two date values that contain a time. I want to find out how many minutes difference there is between the two. This seems like something easy that is built in. Any thoughts? I know I could find the date difference multiply it by number of minutes in a day and then add the minute differences between the minute pieces. ...

90. Unsure about using date/time functions

I'm trying to write a method that inserts tomorrow's date -18 years i.e.( 01/07/1990) if I excecuted the code today, but (02/07/1990) if I were to run the same piece of code tomorrow. I then need to convert the date returned into a string so I can use it in another part of the program. I've checked out the Calendar in ...

91. Date-Time arithmetic

I have a database that has datetime values in it. I need to be able to calculate elapsed time between some of these fields. I've been checking the available classes, but I don't see any that make this doable. For that matter - creating a time or date class with me having to calculate the milliseconds for a "new"seems unwieldly at ...

92. Convert DateTime to String

93. Date/Time Field Query

Okay. So you have to change the time to 23:59:59. If you don't know how to do that in your system, or you don't understand the ramifications of changing it, then there isn't anything we can help you with there. Ask other people who do know something about your system. (Actually changing the time to 23:59:59 means you miss events that ...

95. Accurate date/time...

96. DateTime subtraction

GregorianCalendar fromdate = info.getLocalCalendar(nFromYear, nFromMonth, nFromDay, strSelectedTimeZone); fromdate.add(Calendar.DATE,i); java.util.Calendar date = (java.util.Calendar) fromdate.clone(); date.set(Calendar.HOUR_OF_DAY, hourFromInt); date.set(Calendar.MINUTE, minuteFromInt); date.set(Calendar.SECOND, secondFromInt); date.set(Calendar.MILLISECOND, 0); lFromTime = date.getTime().getTime() / 1000; GregorianCalendar todate = g_entityinfo.getLocalCalendar(nFromYear, nFromMonth, nFromDay, strSelectedTimeZone); todate.add(Calendar.DATE,i); java.util.Calendar date = (java.util.Calendar) todate.clone(); date.set(Calendar.HOUR_OF_DAY, hourToInt); date.set(Calendar.MINUTE, minuteToInt); date.set(Calendar.SECOND, secondToInt); date.set(Calendar.MILLISECOND, 999); ...

97. !!! Please help!

I have to insert into a table (external to my application) a DateTime date value. That table is at MySQL database, as I've said, external to my application. I'm programming with Eclipse, and the date I get from my database is a timestamp field. So I would need to cast my timestamp field to datetime field. I don't found any package ...

98. How to query the Date/Time Dataype

Rock, May I know more detail on your specs? What is your DB? Or how is exactly you execute the sql. to_date is anyway an Oracle syntax. So I guess your DB might be an SQL Server. to_date for oracle is equivalent as Convert in SQL Server example Select Convert(datetime ,'2002/01/01') Hope it works now

99. Subtract minutes from a datetime object

I am querying a db and selecting a date time object. how can I subtract for example 10 minutes from that date time object? ultimately i am pulling the latest datetime from the database, to in turn do another query for data entered in the past 10 minutes. which means I am trying to pull the current datetime - 10 minutes, ...

100. Converting datetime to Date