(Java) JSON Date Parsing

Demonstrates how to parse date/time strings from JSON.

Note: This example uses the DtOf and DateOf methods introduced in Chilkat v9.5.0.73

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success;

    CkJsonObject json = new CkJsonObject();
    json.put_EmitCompact(false);

    // First, let's create JSON containing some date/time strings.
    json.UpdateString("test.timestamp","2018-01-30T20:35:00Z");
    json.UpdateString("test.rfc822","Tue, 24 Apr 2018 08:47:03 -0500");
    json.UpdateString("test.dateStrings[0]","2018-01-30T20:35:00Z");
    json.UpdateString("test.dateStrings[1]","Tue, 24 Apr 2018 08:47:03 -0500");
    json.UpdateNumber("test.StartLoggingTime","1446834998.695");
    json.UpdateNumber("test.Expiration","1442877512.0");
    json.UpdateInt("test.StartTime",1518867432);

    System.out.println(json.emit());

    // We've built the following JSON:

    // {
    //   "test": {
    //     "timestamp": "2018-01-30T20:35:00Z",
    //     "rfc822": "Tue, 24 Apr 2018 08:47:03 -0500",
    //     "dateStrings": [
    //       "2018-01-30T20:35:00Z",
    //       "Tue, 24 Apr 2018 08:47:03 -0500"
    //     ],
    //     "StartLoggingTime": 1446834998.695,
    //     "Expiration": 1442877512.0,
    //     "StartTime": 1518867432
    //   }
    // }

    // Use the DateOf and DtOf methods to load Chilkat date/time objects with the date/time values.
    // The CkDateTime object is primarily for loading a date/time from numerous formats, and then getting
    // the date/time in various formats.  Thus, it's primarly for date/time format conversion.
    // The DtObj object holds a date/time where the individual components (day, month, year, hour, minutes, etc.) are 
    // immediately accessible as integers.
    CkDateTime dateTime = new CkDateTime();
    CkDtObj dt = new CkDtObj();
    boolean getAsLocal = false;

    // Load the date/time at test.timestamp into the dateTime object.
    success = json.DateOf("test.timestamp",dateTime);
    System.out.println(dateTime.getAsTimestamp(getAsLocal));
    System.out.println(dateTime.GetAsUnixTime(false));
    System.out.println(dateTime.getAsRfc822(getAsLocal));

    success = json.DateOf("test.rfc822",dateTime);
    System.out.println(dateTime.getAsTimestamp(getAsLocal));

    json.put_I(0);
    success = json.DateOf("test.dateStrings[i]",dateTime);
    System.out.println(dateTime.getAsTimestamp(getAsLocal));

    json.put_I(1);
    success = json.DateOf("test.dateStrings[i]",dateTime);
    System.out.println(dateTime.getAsTimestamp(getAsLocal));

    success = json.DateOf("test.StartLoggingTime",dateTime);
    System.out.println(dateTime.getAsTimestamp(getAsLocal));

    success = json.DateOf("test.Expiration",dateTime);
    System.out.println(dateTime.getAsTimestamp(getAsLocal));

    success = json.DateOf("test.StartTime",dateTime);
    System.out.println(dateTime.getAsTimestamp(getAsLocal));

    // Output so far:

    // 	2018-01-30T20:35:00Z
    // 	1517344500
    // 	Tue, 30 Jan 2018 20:35:00 GMT
    // 	2018-04-24T13:47:03Z
    // 	2018-01-30T20:35:00Z
    // 	2018-04-24T13:47:03Z
    // 	2015-11-07T00:36:38Z
    // 	2015-09-22T04:18:32Z
    // 	2018-02-17T17:37:12Z

    // Now load the date/time strings into the dt object:
    success = json.DtOf("test.timestamp",getAsLocal,dt);
    System.out.println("month=" + dt.get_Month() + ", day=" + dt.get_Day() + ", year=" + dt.get_Year() + ", hour="
         + dt.get_Hour() + ", minute=" + dt.get_Minute());

    success = json.DtOf("test.rfc822",getAsLocal,dt);
    System.out.println("month=" + dt.get_Month() + ", day=" + dt.get_Day() + ", year=" + dt.get_Year() + ", hour="
         + dt.get_Hour() + ", minute=" + dt.get_Minute());

    json.put_I(0);
    success = json.DtOf("test.dateStrings[i]",getAsLocal,dt);
    System.out.println("month=" + dt.get_Month() + ", day=" + dt.get_Day() + ", year=" + dt.get_Year() + ", hour="
         + dt.get_Hour() + ", minute=" + dt.get_Minute());

    json.put_I(1);
    success = json.DtOf("test.dateStrings[i]",getAsLocal,dt);
    System.out.println("month=" + dt.get_Month() + ", day=" + dt.get_Day() + ", year=" + dt.get_Year() + ", hour="
         + dt.get_Hour() + ", minute=" + dt.get_Minute());

    success = json.DtOf("test.StartLoggingTime",getAsLocal,dt);
    System.out.println("month=" + dt.get_Month() + ", day=" + dt.get_Day() + ", year=" + dt.get_Year() + ", hour="
         + dt.get_Hour() + ", minute=" + dt.get_Minute());

    success = json.DtOf("test.Expiration",getAsLocal,dt);
    System.out.println("month=" + dt.get_Month() + ", day=" + dt.get_Day() + ", year=" + dt.get_Year() + ", hour="
         + dt.get_Hour() + ", minute=" + dt.get_Minute());

    success = json.DtOf("test.StartTime",getAsLocal,dt);
    System.out.println("month=" + dt.get_Month() + ", day=" + dt.get_Day() + ", year=" + dt.get_Year() + ", hour="
         + dt.get_Hour() + ", minute=" + dt.get_Minute());

    // Output:

    // month=1, day=30, year=2018, hour=20, minute=35
    // month=4, day=24, year=2018, hour=13, minute=47
    // month=1, day=30, year=2018, hour=20, minute=35
    // month=4, day=24, year=2018, hour=13, minute=47
    // month=11, day=6, year=2015, hour=18, minute=36
    // month=9, day=21, year=2015, hour=23, minute=18
    // month=2, day=17, year=2018, hour=11, minute=37
  }
}