Java Util Calendar Epoch Example
Get Java Util Calendar From Days Since Epoch
Get java.util.Calendar from days since epoch
Tags: java , date , calendar Answers: 1 | Viewed 8,313 times
I have a variable containing the days since the epoch reference date of 1970-01-01 for a certain date.
Does someone know the way to convert this variable to a java.util.Calendar?
musiKk answer at 2011-05-23
The following should work:
Calendar c = new GregorianCalendar();
c.setTime(new Date(0));
c.add(Calendar.DAY_OF_YEAR, 1000);
System.err.println(c.getTime());
A note regarding time zones:
A new GregorianCalendar instance is created using the default time zone of the system the program is running on. Since Epoch is relative to UTC (GMT in Java) any time zone different from UTC must be handled with care. The following program illustrates the problem:
TimeZone.setDefault(TimeZone.getTimeZone("GMT-1"));
Calendar c = new GregorianCalendar();
c.setTimeInMillis(0);
System.err.println(c.getTime());
System.err.println(c.get(Calendar.DAY_OF_YEAR));
c.add(Calendar.DAY_OF_YEAR, 1);
System.err.println(c.getTime());
System.err.println(c.get(Calendar.DAY_OF_YEAR));
This prints
Wed Dec 31 23:00:00 GMT-01:00 1969
365
Thu Jan 01 23:00:00 GMT-01:00 1970
1
This demonstrates that it is not enough to use e.g. c.get(Calendar.DAY_OF_YEAR). In this case one must always take into account what time of day it is. This can be avoided by using GMT explicitly when creating the GregorianCalendar: new GregorianCalendar(TimeZone.getTimeZone("GMT")). If the calendar is created such, the output is:
Wed Dec 31 23:00:00 GMT-01:00 1969
1
Thu Jan 01 23:00:00 GMT-01:00 1970
2
Now the calendar returns useful values. The reason why the Date returned by c.getTime() is still "off" is that the toString() method uses the default TimeZone to build the string. At the top we set this to GMT-1 so everything is normal.
* The answers/resolutions are collected from stackoverflow, are licensed under CC BY-SA 3.0
In Java, you have 64 bits integers, and that's what you're using.
In JavaScript, all numbers are 64 bits floating point numbers. This means you can't represent in JavaScript all the Java longs. The size of the mantissa is about 53 bits, which means that your number, 793548328091516928, can't be exactly represented as a JavaScript number.
If you really need to deal with such numbers, you have to represent them in another way. This could be a string, or a specific representation like a digit array. Some "big numbers" libraries are available in JavaScript.
Import the project as a java project. Then in the 'Project Structure' box, click on the module and click the + sign. This allows you to add, e.g., a Python "facet" to the module. I use this frequently to develop mixed Java/Python modules.
There is nothing specific to cloud MVC. Even if it is a proxy, we have to add CORS support to the web application.
As it is a spring boot project, I have added spring security as well here. Added a filter which can populate the headers did the job.
Note : add whatever required headers for your OPTION call (preflight),
Also support GET,POST, DELETE, etc calls accordingly.
The response headers can be added to the http response
I found the "bug" .
The problem was that I was doing the http post request as follows :
this.httpClient.post<any>("SERVER_URL", "{email: " + result.user.email + "}").subscribe
Meaning that I forgot to add from front end this part :
const httpOptions = {
headers: new HttpHeaders({
'Content-Type': 'application/json'
})
};
and add it as a parameter as follows
this.httpClient.post<any>("SERVER_URL", "{email: " + result.user.email + "}", httpOptions).subscribe
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