Java date and time issue with BBB

Question

Hi all

In my java app i am reading date time from BBB with externally connected RTC using java library that provided for data/time, my issue is i am not able to read time as expected(hh:mm:ss), anybody faced similar issue?, is there any solution?

Former Member · Answer

this means that we need a way to set the time when the board is running. If you wish to set the time you could do it on a once-off basis… root@beaglebone:~# date Sat Jan 1 12:27:56 GMT 2000 Shell root@beaglebone:~# ntpdate -b -s -u pool.ntp.org root@beaglebone:~# date Sat May 18 22:52:56 BST 2013 Next, find a NTP server that is close to your location. We need to do this to be good ‘ntp citizens’ as it is not good to use a NTP root server as they are already heavily loaded … it is better to use a NTP pool server that is close to your location in order to help with load balancing. # This is the most basic ntp configuration file # The driftfile must remain in a place specific to this # machine - it records the machine specific clock error driftfile /etc/ntp.drift logfile /var/log/ntpd.log # NTP Servers for Ireland from www.pool.ntp.org server 0.ie.pool.ntp.org server 1.ie.pool.ntp . org server 2.ie.pool.ntp.org server 3.ie.pool.ntp.org # Using local hardware clock as fallback # Disable this when using ntpd -q -g -x as ntpdate or it will sync to itself # server 127.127.1.0 # fudge 127.127.1.0 stratum 14 # Defining a default security setting restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap The LocalTime class is similar to the other classes whose names are prefixed with Local, but deals in time only. This class is useful for representing human-based time of day, such as movie times, or the opening and closing times of the local library. It could also be used to create a digital clock, as shown in the following example: LocalTime thisSec; for (;;) { thisSec = LocalTime.now(); // implementation of display code is left to the reader display(thisSec.getHour(), thisSec.getMinute(), thisSec.getSecond()); } The LocalTime class does not store time zone or daylight saving time information.

Former Member · Answer

Speaking of time zone, you can retrieve it as a symbol or offset from UTC along with the local date and time by using Java 8 class ZonedDateTime. A simple example follows.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

import java.time.format.DateTimeFormatter; 
import java.time.ZonedDateTime;  
public class dateeg {
      public static void main( String [ ] args )      {
           ZonedDateTime zdt = ZonedDateTime.now();
           DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss VV");
           System.out.println( "Now = " + zdt.format(formatter) );
      } 
}

Execution for me in Dallas Texas USA:
Now = 13:17:18 America/Chicago