i have a time stamp coming in my XML that i put into my database.
The time stamp is in the format of number of seconds gone by since 1970.
i want to convert that into a date object.
how do i go about it?
thank you in advance.
You can create a Date instance based on the number of milliseconds since Jan 1, 1970. Your value is expressed in seconds, but that a trivial conversion:
long timestamp = getTimestampInSeconds(); // some megic to get the value
Date date = new Date(timestamp * 1000); // convert to milliseconds
Date class has special constructor for this:
Date result = new Date(numberOfSec * 1000);
Further you can format your Date object as you like using SimpleDateFormat.
See the doc.
It's been awhile since the question been asked, but i just faced the same trouble.
And I found out that the trouble is in the variable type. Are you using integer to store the timestamp value? Try using long. It worked for me
Related
I am trying to get the difference between the current time and the time which is stored in DB.
I tried below code but its not giving the correct result since java.lang.System.currentTimeMillis() returns
UTC time whereas we save date to our application in EST format.
Code :
java.lang.System.currentTimeMillis() - emp.getModifiedDate()
Could you please suggest me a correct way to do it ?It will be very helpful for me
Thanks
System.currentTimeMillis() returns the number of milliseconds since January 1, 1970 UTC. It is time-zone agnostic.
If you are storing the time in the database as millis then simply subtracting the two numbers will give you the correct difference.
If you are storing the time in some other way (e.g. as a String), you can parse it (e.g. with SimpleDateFormat) to take into account the time zone and then obtain a Date from which you can obtain the millis.
Hope this helps! This will give you difference in no of days.
Date date1 = new Date();
long diff = date1.getTime() - emp.getModifiedDate().getTime();
System.out.println((int) (diff) / (1000 * 60 * 60 * 24)));
For more read this
I want to calculate the difference between the current date and a date stored in a database which I have stored as a variable. Here are my problems:
I am dealing with java.util.Date for the currDate and java.sql.Date for the stored date - call it startDate. As I store startDate into my program as a variable it truncates the hours, minutes, and seconds of the DATE object. I assume this is a problem with converting.
I am not sure how the UTC effects my calculation??
I am very new to coding, any help would be greatly appreciated...
ResultSet#getDate returns only the date part. If you want to get the full timestamp including hours, minutes, etc, you should user ResultSet#getTimestamp instead.
Regarding jFreeChart's Millisecond,
How can I get a java.util.Date object from a Millisecond instance?
From the docs, it only seems possible to subtract the milliseconds within Millisecond.
Since a Millisecond object is constructed like so:
Millisecond ms = new Millisecond(
millisec,
second,
minute,
hour,
day,
month,
year);
I should be able to extract a valid Date object as well.
Edit
I need a Date object that gives back the exact time up to the millisecond accurate.
Does .getStart() provide this?
[ANSWER]: YES
Millisecond is like any other RegularTimePeriod in JFreeChart, so you can just
Date d = ms.getStart();
or
Date d = ms.getEnd();
depending on whether you want a date referring to the beginning or the end of your millisecond (same value either way).
See The JFreeChart API for more info.
EDIT: Adding code here since comments kill formatting:
Millisecond ms = new Millisecond();
System.out.println(ms.getStart().getTime());
System.out.println(ms.getEnd().getTime());
will print the same millisecond twice.
As far as I can see the Millisecond Class represents the time period of a millisecond and I'd assume the the getStart and getEnd Methods inherited from RegularTimePeriod return (nearly) the same Date of which one is one you're looking for.
(my answer was late) Perhaps you could use this code:
java.util.Date date = new java.util.Date(freeMillis.getMillisecond());
edit: scrap that, freeMillis.getMillisecond() returns just a millisecond part.
I'm making a basic Java program that reads in a subtitle (.srt) file and I would like to store each time as a Date object. I really only need to keep track of Hours, minutes, seconds, and milliseconds (to 3 digits). I think I am able to store it using this:
String start = "00:01:01,604";
DateFormat sdf = new SimpleDateFormat("hh:mm:ss,SSS");
Date startDate = sdf.parse(start);
For retrieving, I can do something like this:
return String.format("\nStart: %d:%d:%dText: %s\n", startDate.getHours(),startDate.getMinutes(), startDate.getSeconds(), text);
I'm looking for something that would do something similar to getMilliseconds (if it existed). Thank you very much!
What you're handling is not a date! Don't use the Date class to handle it! Dates have strange extra rules that you don't care about and that could easily trip you up (just think of leap years, leap seconds and time zones).
You should either
use a long to hold the milliseconds and handle the calculation on your own (it's not so hard, you're not implementing a calendar) or
use an existing duration class such as the one from Joda Time.
The recommended way to get access to part of date (hours,minutes, etc.) in Java is now using Calendar.get(Calendar.MILISECONDS), see javadocs. In case of your code it would look like this:
Date startDate = sdf.parse(start);
Calendar calendar = Calendar.getInstance();
calendar.setTime(startDate);
int milliseconds = calendar.get(Calendar.MILISECONDS);
P.S. Please note that regarding to javadocs Date.getHours(),Date.getSeconds(), etc. methods are currently deprecated anyway. Don't use them :).
Just call date.getTime() and get milliseconds.
You can always use Date.getTime() for getting value in milliseconds. It will return a value in long format
I searched topics about formatting time but these were all about Date class or DateTime. I am working with Time class. I created time as:
Time time = new Time(Time.getCurrentTimezone()) ;
time.setToNow();
String berkay = time.toString();
System.out.println(berkay);
When I execute it the output is :
20130417T070525GMT(3,106,0,0,1366182325)
actually date and time is correct (2013-04-17 07:05:25)
but I need to convert it into : 20130417070525 (My reason to do this is I will search database according to date so it is easier to compare times in that format)
How can I convert it?
Try this:
Time time = new Time(System.currentTimeMillis()) ;
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
String date = df.format(time).toString();
System.out.println(date);
EDIT
But as smttsp suggested its much more efficient to store it as timestamp
To convert java.util.Date into String you should consider java.text.SimpleDateFormat.
For using java.util.Date as a parameter of a database query you should pass the Date as is without converting it into any other format.
passing Date parameter to create date range query
<- In the answer there is sample how to create such query.
It is a bit late but if you are working on time and you need to compare or sort, the best way is to use Unix timestamp. It starts from 1-Jan-1970 00:00:00 and increments 1 each second.
It is a long value(64 bit) which is quite efficient to use in both time and space. Here is the website for Unix timestamp conversion.
Also 20130417070525 is 14 char string(at least 15 byte, I guess) and 1366182325 is long(8 byte). So go for long value. U can get it in that way
Date myDate = new Date(); // current time
myDate.getTime(); // converts it to specified format.