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Full Discussion: Java Date Class
Top Forums Programming Java Date Class Post 302924424 by junior-helper on Sunday 9th of November 2014 02:38:12 PM
Old 11-09-2014
Java

Integer.parseInt has a funny side effect though. It will convert 000 to 0, 03 to 3 and so on.
Code:
import java.util.Date; // mandatory only for the "current date and time" part

public class prob4
 {
    public static void main(String args[])
    {

    String ArgumentFromCommandLine = "";
    int time = 0;

    // exit program if the supplied argument is not an integer OR
    // if no or too many arguments were supplied
    if (args.length == 1) {
        try {
        ArgumentFromCommandLine = args[0];
            time = Integer.parseInt(ArgumentFromCommandLine);
        } catch (NumberFormatException e) {
            System.err.println("Argument " + args[0] + " must be an integer.");
            System.exit(1);
        }
    }
    else {
        System.err.println("No or too many arguments were supplied.");
            System.exit(1);
    }

    // collect all values
    Long utms = System.currentTimeMillis(); // UNIX time in milliseconds
    Long uts = utms / 1000; // UNIX time in seconds
    Long utd = uts / 86400; // UNIX time in days
    Date dateandtime = new Date(); // Current date and time, default format

    // print requested value
        switch ( time )
    {
        case 0:
            System.out.println("Milliseconds since 1970: " + utms);
            break;
        case 1:
            System.out.println("Seconds since 1970: " + uts);
            break;
        case 2:
            System.out.println("Days since 1970: " + utd);
            break;
        case 3:
            System.out.println("Current date and time: " + dateandtime);
            break;
        default:
            System.out.println("Invalid");
    }

    }

}

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DATETIME.__CONSTRUCT(3) 						 1						   DATETIME.__CONSTRUCT(3)

DateTime::__construct - Returns new DateTime object

       Object oriented style

SYNOPSIS
public DateTime::__construct NULL ([string $time = "now"], [DateTimeZone $timezone]) DESCRIPTION
Procedural style DateTime date_create NULL ([string $time = "now"], [DateTimeZone $timezone]) Returns new DateTime object. PARAMETERS
o $time -A date/time string. Valid formats are explained in Date and Time Formats. Enter NULL here to obtain the current time when using the $timezone parameter. o $timezone - A DateTimeZone object representing the timezone of $time. If $timezone is omitted, the current timezone will be used. Note The $timezone parameter and the current timezone are ignored when the $time parameter either is a UNIX timestamp (e.g. @946684800) or specifies a timezone (e.g. 2010-01-28T15:00:00+02:00). RETURN VALUES
Returns a new DateTime instance. Procedural style returns FALSE on failure. ERRORS
/EXCEPTIONS Emits Exception in case of an error. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | If $time contains an invalid date/time format, | | | then an exception is now thrown. Previously an | | | error was emitted. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 DateTime.__construct(3) example Object oriented style <?php try { $date = new DateTime('2000-01-01'); } catch (Exception $e) { echo $e->getMessage(); exit(1); } echo $date->format('Y-m-d'); ?> Procedural style <?php $date = date_create('2000-01-01'); if (!$date) { $e = date_get_last_errors(); foreach ($e['errors'] as $error) { echo "$error "; } exit(1); } echo date_format($date, 'Y-m-d'); ?> The above examples will output: 2000-01-01 Example #2 Intricacies of DateTime.__construct(3) <?php // Specified date/time in your computer's time zone. $date = new DateTime('2000-01-01'); echo $date->format('Y-m-d H:i:sP') . " "; // Specified date/time in the specified time zone. $date = new DateTime('2000-01-01', new DateTimeZone('Pacific/Nauru')); echo $date->format('Y-m-d H:i:sP') . " "; // Current date/time in your computer's time zone. $date = new DateTime(); echo $date->format('Y-m-d H:i:sP') . " "; // Current date/time in the specified time zone. $date = new DateTime(null, new DateTimeZone('Pacific/Nauru')); echo $date->format('Y-m-d H:i:sP') . " "; // Using a UNIX timestamp. Notice the result is in the UTC time zone. $date = new DateTime('@946684800'); echo $date->format('Y-m-d H:i:sP') . " "; // Non-existent values roll over. $date = new DateTime('2000-02-30'); echo $date->format('Y-m-d H:i:sP') . " "; ?> The above example will output something similar to: 2000-01-01 00:00:00-05:00 2000-01-01 00:00:00+12:00 2010-04-24 10:24:16-04:00 2010-04-25 02:24:16+12:00 2000-01-01 00:00:00+00:00 2000-03-01 00:00:00-05:00 SEE ALSO
DateTime.createFromFormat(3), DateTimeZone.__construct(3), Date and Time Formats, date.timezone ini setting, date_default_time- zone_set(3), DateTime.getLastErrors(3), checkdate(3). PHP Documentation Group DATETIME.__CONSTRUCT(3)
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