I am looking at the Date documentation and trying to figure out how I can express NOW + 5 seconds. Here's some pseudocode:
import java.util.Date
public class Main {
public static void main(String args[]) {
Date now = new Date();
now.setSeconds(now.getSeconds() + 5);
}
}
Instant // Use modern `java.time.Instant` class to represent a moment in UTC.
.now() // Capture the current moment in UTC.
.plusSeconds( 5 ) // Add five seconds into the future. Returns another `Instant` object per the Immutable Objects pattern.
Use the modern java.time classes that years ago supplanted the terrible Date & Calendar classes.
To work in UTC, use Instant.
Instant later = Instant.now().plusSeconds( 5 ) ;
To work in a specific time zone, use ZonedDateTime.
ZoneId z = ZoneId.of( "America/Montreal" ) ;
ZonedDateTime later = ZonedDateTime.now( z ).pluSeconds( 5 ) ;
DurationYou can soft-code the amount and granularity of time to add. Use the Duration class.
Duration d = Duration.ofSeconds( 5 ) ;
Instant later = Instant.now().plus( d ) ; // Soft-code the amount of time to add or subtract.
The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.
You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes. Hibernate 5 & JPA 2.2 support java.time.
Where to obtain the java.time classes?
Try This..
Date now = new Date();
System.out.println(now);
Calendar c = Calendar.getInstance();
c.setTime(now);
c.add(Calendar.SECOND, 5);
now = c.getTime();
System.out.println(now);
// Output
Tue Jun 11 16:46:43 BDT 2019
Tue Jun 11 16:46:48 BDT 2019