CODEWITHSUNDEEP
javacwinapitimesynchronization
biowigus
biowigus

Reputation: 17

Get actual time (java, c) synchronized

i am working on easy game(just for fun). I have server in c and client in java.

I want get actual time on server and on client, but I can not come to the same results time.

On server i am using:

// the system time
SYSTEMTIME systemTime;
GetSystemTime(&systemTime);

// the current file time
FILETIME fileTime;
SystemTimeToFileTime(&systemTime, &fileTime);

// filetime in 100 nanosecond resolution
ULONGLONG fileTimeNano100;
fileTimeNano100 = (((ULONGLONG) fileTime.dwHighDateTime) << 32) + fileTime.dwLowDateTime;

//to milliseconds and unix windows epoche offset removed
ULONGLONG posixTime = fileTimeNano100 / 10000 - 11644473600000;
return posixTime;

And i am getting time in format(output): 1750721123

On client i am using

long lDateTime = new Date().getTime();
System.out.println("Date() - Time in milliseconds: " + lDateTime);

Calendar lCDateTime = Calendar.getInstance();
System.out.println("Calender - Time in milliseconds :" + lCDateTime.getTimeInMillis());

And i am gettin format(output):

Calender - Time in milliseconds :1419089968022
Date() - Time in milliseconds: 1419089968022

Why? Where is the problem? How can i get the same TIME?

Both programs run on the same pc(win 8.1)

Upvotes: 1

Views: 166

Answers (1)

dagi12
dagi12

Reputation: 459

First of all. First block of code doesn't seem to be standard C code at all or rather you use some libraries that I just simply doesn't know.

There is no simple way to get actual time with less than a second accuracy in standard C. But here is the example with Java and C that actually works, so I hope this would help.

Java

package stackOverflow;

import java.util.Date;

public class Main {

    public static void main(String[] args) {
        long lDateTime = new Date().getTime();
        System.out.println(lDateTime/1000);
    }

}

Output: 1436200408

C

#include<stdio.h>
#include<stdlib.h>
#include<sys/time.h>
#include<time.h>

int main(void) {
    struct timeval tv;

    gettimeofday(&tv, NULL);
    printf("%ld\n", tv.tv_sec);

    return 0;
}

Output: 1436200418

Upvotes: 1

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