find current Date and day after tomorrow's date in java

Question

How to find current date in java. I found a lot but every time i got same command Date d = new Date(); or something similar Every such command returns a date of 1970 year. I fail to understand, Whats the benefit of this getting a date of 1970 ? Is there any way where i can get current time and add a second into it. My real purpose is to convert a long value into Date and add a second in it. 5:40:12 should give me 5:40:13 after adding a second. Any help would be appreciated as i am fed up getting 1970 date.

Answer 1

My real purpose is to convert a long value into Date and add a second in it. 5:40:12 should give me 5:40:13 after adding a second

The troublesome java.util.Date class is now legacy, supplanted by the java.time classes.

Instant.ofEpochMilli( yourLongIntegerGoesHere )  // A moment on the timeline in UTC represented a count of nanoseconds since the epoch of `1970-01-01T00:00:00Z`.
       .atZone( ZoneId.of( "Pacific/Auckland" )  // Time zone for the region whose wall-clock time you want to see.
       .plusSeconds( 1 )
       .toLocalTime()                            // Extract just the time-of-day without date and without time zone.
       .toString()                               // Generate a string representing the time-of-day value in standard ISO 8601 format.

05:40:13

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About java.time

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.

The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

Where to obtain the java.time classes?

• Java SE 8, Java SE 9, and later
  • Built-in.
  • Part of the standard Java API with a bundled implementation.
  • Java 9 adds some minor features and fixes.
• Java SE 6 and Java SE 7
  • Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
• Android
  • The ThreeTenABP project adapts ThreeTen-Backport (mentioned above) for Android specifically.
  • See How to use ThreeTenABP….

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

Answer 2

Java.Util.Date class is deprecated, I would recommend using

Java.Util.Calendar instead.  

If you're looking to add a second to Current date, try something like this:

Calendar currentTime = Calendar.getInstance(); // gets a calendar using the default time zone and locale.
calendar.add(currentTime.SECOND, 1);
System.out.println(currentTime.getTime());

BUT, the reason why you are receiving a 1970 date when using the Date class is because that class works with milliseconds, so you must multiply the long value by 1000 in order for it to convert to a date, here's an example.

Date currentDate = new Date( YourLongValue * 1000);