Rust

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

Rust

let json = chilkat::JsonObject::new();
json.set_emit_compact(false);

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

println!("{}", json.emit().unwrap_or_default());

// 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.
let date_time = chilkat::DateTime::new();
let dt = chilkat::DtObj::new();
let get_as_local = false;

// Load the date/time at test.timestamp into the dateTime object.
let _ = json.date_of("test.timestamp", &date_time).is_ok();
println!("{}", date_time.get_as_timestamp(get_as_local).unwrap_or_default());
println!("{}", date_time.get_as_unix_time(false));
println!("{}", date_time.get_as_rfc822(get_as_local).unwrap_or_default());

let _ = json.date_of("test.rfc822", &date_time).is_ok();
println!("{}", date_time.get_as_timestamp(get_as_local).unwrap_or_default());

json.set_i(0);
let _ = json.date_of("test.dateStrings[i]", &date_time).is_ok();
println!("{}", date_time.get_as_timestamp(get_as_local).unwrap_or_default());

json.set_i(1);
let _ = json.date_of("test.dateStrings[i]", &date_time).is_ok();
println!("{}", date_time.get_as_timestamp(get_as_local).unwrap_or_default());

let _ = json.date_of("test.StartLoggingTime", &date_time).is_ok();
println!("{}", date_time.get_as_timestamp(get_as_local).unwrap_or_default());

let _ = json.date_of("test.Expiration", &date_time).is_ok();
println!("{}", date_time.get_as_timestamp(get_as_local).unwrap_or_default());

let _ = json.date_of("test.StartTime", &date_time).is_ok();
println!("{}", date_time.get_as_timestamp(get_as_local).unwrap_or_default());

// 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:
let _ = json.dt_of("test.timestamp", get_as_local, &dt).is_ok();
println!("month={}, day={}, year={}, hour={}, minute={}", dt.month(), dt.day(), dt.year(), dt.hour(), dt.minute());

let _ = json.dt_of("test.rfc822", get_as_local, &dt).is_ok();
println!("month={}, day={}, year={}, hour={}, minute={}", dt.month(), dt.day(), dt.year(), dt.hour(), dt.minute());

json.set_i(0);
let _ = json.dt_of("test.dateStrings[i]", get_as_local, &dt).is_ok();
println!("month={}, day={}, year={}, hour={}, minute={}", dt.month(), dt.day(), dt.year(), dt.hour(), dt.minute());

json.set_i(1);
let _ = json.dt_of("test.dateStrings[i]", get_as_local, &dt).is_ok();
println!("month={}, day={}, year={}, hour={}, minute={}", dt.month(), dt.day(), dt.year(), dt.hour(), dt.minute());

let _ = json.dt_of("test.StartLoggingTime", get_as_local, &dt).is_ok();
println!("month={}, day={}, year={}, hour={}, minute={}", dt.month(), dt.day(), dt.year(), dt.hour(), dt.minute());

let _ = json.dt_of("test.Expiration", get_as_local, &dt).is_ok();
println!("month={}, day={}, year={}, hour={}, minute={}", dt.month(), dt.day(), dt.year(), dt.hour(), dt.minute());

let _ = json.dt_of("test.StartTime", get_as_local, &dt).is_ok();
println!("month={}, day={}, year={}, hour={}, minute={}", dt.month(), dt.day(), dt.year(), dt.hour(), 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