Dart

JSON Date Parsing

See more JSON Examples

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

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final json = CkJsonObject();
  json.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);

  print(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.
  final dateTime = CkDateTime();
  final dt = CkDtObj();
  final getAsLocal = false;

  // Load the date/time at test.timestamp into the dateTime object.
  json.dateOf('test.timestamp', dateTime);
  print(dateTime.getAsTimestamp(getAsLocal));
  print(dateTime.getAsUnixTime(false));
  print(dateTime.getAsRfc822(getAsLocal));

  json.dateOf('test.rfc822', dateTime);
  print(dateTime.getAsTimestamp(getAsLocal));

  json.i = 0;
  json.dateOf('test.dateStrings[i]', dateTime);
  print(dateTime.getAsTimestamp(getAsLocal));

  json.i = 1;
  json.dateOf('test.dateStrings[i]', dateTime);
  print(dateTime.getAsTimestamp(getAsLocal));

  json.dateOf('test.StartLoggingTime', dateTime);
  print(dateTime.getAsTimestamp(getAsLocal));

  json.dateOf('test.Expiration', dateTime);
  print(dateTime.getAsTimestamp(getAsLocal));

  json.dateOf('test.StartTime', dateTime);
  print(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:
  json.dtOf('test.timestamp', getAsLocal, dt);
  print('month=${dt.month}, day=${dt.day}, year=${dt.year}, hour=${dt.hour}, minute=${dt.minute}');

  json.dtOf('test.rfc822', getAsLocal, dt);
  print('month=${dt.month}, day=${dt.day}, year=${dt.year}, hour=${dt.hour}, minute=${dt.minute}');

  json.i = 0;
  json.dtOf('test.dateStrings[i]', getAsLocal, dt);
  print('month=${dt.month}, day=${dt.day}, year=${dt.year}, hour=${dt.hour}, minute=${dt.minute}');

  json.i = 1;
  json.dtOf('test.dateStrings[i]', getAsLocal, dt);
  print('month=${dt.month}, day=${dt.day}, year=${dt.year}, hour=${dt.hour}, minute=${dt.minute}');

  json.dtOf('test.StartLoggingTime', getAsLocal, dt);
  print('month=${dt.month}, day=${dt.day}, year=${dt.year}, hour=${dt.hour}, minute=${dt.minute}');

  json.dtOf('test.Expiration', getAsLocal, dt);
  print('month=${dt.month}, day=${dt.day}, year=${dt.year}, hour=${dt.hour}, minute=${dt.minute}');

  json.dtOf('test.StartTime', getAsLocal, dt);
  print('month=${dt.month}, day=${dt.day}, year=${dt.year}, hour=${dt.hour}, minute=${dt.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
}