(Objective-C) 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 <CkoJsonObject.h>
#import <CkoDateTime.h>
#import <CkoDtObj.h>

BOOL success;

CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;

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

NSLog(@"%@",[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.
CkoDateTime *dateTime = [[CkoDateTime alloc] init];
CkoDtObj *dt = [[CkoDtObj alloc] init];
BOOL getAsLocal = NO;

// Load the date/time at test.timestamp into the dateTime object.
success = [json DateOf: @"test.timestamp" dateTime: dateTime];
NSLog(@"%@",[dateTime GetAsTimestamp: getAsLocal]);
NSLog(@"%d",[dateTime GetAsUnixTime: NO]);
NSLog(@"%@",[dateTime GetAsRfc822: getAsLocal]);

success = [json DateOf: @"test.rfc822" dateTime: dateTime];
NSLog(@"%@",[dateTime GetAsTimestamp: getAsLocal]);

json.I = [NSNumber numberWithInt:0];
success = [json DateOf: @"test.dateStrings[i]" dateTime: dateTime];
NSLog(@"%@",[dateTime GetAsTimestamp: getAsLocal]);

json.I = [NSNumber numberWithInt:1];
success = [json DateOf: @"test.dateStrings[i]" dateTime: dateTime];
NSLog(@"%@",[dateTime GetAsTimestamp: getAsLocal]);

success = [json DateOf: @"test.StartLoggingTime" dateTime: dateTime];
NSLog(@"%@",[dateTime GetAsTimestamp: getAsLocal]);

success = [json DateOf: @"test.Expiration" dateTime: dateTime];
NSLog(@"%@",[dateTime GetAsTimestamp: getAsLocal]);

success = [json DateOf: @"test.StartTime" dateTime: dateTime];
NSLog(@"%@",[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" bLocal: getAsLocal dt: dt];
NSLog(@"%@%d%@%d%@%d%@%d%@%d",@"month=",[dt.Month intValue],@", day=",[dt.Day intValue],@", year=",[dt.Year intValue]
    ,@", hour=",[dt.Hour intValue],@", minute=",[dt.Minute intValue]);

success = [json DtOf: @"test.rfc822" bLocal: getAsLocal dt: dt];
NSLog(@"%@%d%@%d%@%d%@%d%@%d",@"month=",[dt.Month intValue],@", day=",[dt.Day intValue],@", year=",[dt.Year intValue]
    ,@", hour=",[dt.Hour intValue],@", minute=",[dt.Minute intValue]);

json.I = [NSNumber numberWithInt:0];
success = [json DtOf: @"test.dateStrings[i]" bLocal: getAsLocal dt: dt];
NSLog(@"%@%d%@%d%@%d%@%d%@%d",@"month=",[dt.Month intValue],@", day=",[dt.Day intValue],@", year=",[dt.Year intValue]
    ,@", hour=",[dt.Hour intValue],@", minute=",[dt.Minute intValue]);

json.I = [NSNumber numberWithInt:1];
success = [json DtOf: @"test.dateStrings[i]" bLocal: getAsLocal dt: dt];
NSLog(@"%@%d%@%d%@%d%@%d%@%d",@"month=",[dt.Month intValue],@", day=",[dt.Day intValue],@", year=",[dt.Year intValue]
    ,@", hour=",[dt.Hour intValue],@", minute=",[dt.Minute intValue]);

success = [json DtOf: @"test.StartLoggingTime" bLocal: getAsLocal dt: dt];
NSLog(@"%@%d%@%d%@%d%@%d%@%d",@"month=",[dt.Month intValue],@", day=",[dt.Day intValue],@", year=",[dt.Year intValue]
    ,@", hour=",[dt.Hour intValue],@", minute=",[dt.Minute intValue]);

success = [json DtOf: @"test.Expiration" bLocal: getAsLocal dt: dt];
NSLog(@"%@%d%@%d%@%d%@%d%@%d",@"month=",[dt.Month intValue],@", day=",[dt.Day intValue],@", year=",[dt.Year intValue]
    ,@", hour=",[dt.Hour intValue],@", minute=",[dt.Minute intValue]);

success = [json DtOf: @"test.StartTime" bLocal: getAsLocal dt: dt];
NSLog(@"%@%d%@%d%@%d%@%d%@%d",@"month=",[dt.Month intValue],@", day=",[dt.Day intValue],@", year=",[dt.Year intValue]
    ,@", hour=",[dt.Hour intValue],@", minute=",[dt.Minute intValue]);

// 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