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calendar.h ~ calendar ~ timezone_type
Baptiste Thémine edited this page Oct 24, 2020
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namespace calendar::timezone { typedef /* implementation defined */ timezone_type; }Defines integer type to store UTC time zone offset.
An ISO 8601 valid timezone_type is a signed (+ or -) integer containing 1 to 4 digits, 2 digits representing hour offset in a range from -18 to +18 followed by 2 digits representing minute offset which must equals 00, 15, 30 or 45.
It can be safely handled as a utctz parameter such as in datetime_type or class Date constructor, otherwise the program is ill-formed.
For example :
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+0,+100,-315,+1230,-945are valid time zone offsets. -
+1,+10,+123,+1234,-1900,+1900are not valid time zone offsets. -
-0500is in octal base thus not a valid time zone offset.
<ctime> is required to enable local time zone.
| Name | Description |
|---|---|
UTC |
Represents the zero or zulu UTC time zone. |
LTZ |
Represents the local time zone of the machine, which equals to the current UTC time zone plus Daylight Saving Time. |
| Name | Description |
|---|---|
| operator+ operator- |
Sets time zone offset. |
| operator>> operator<< |
I/O stream operators for calendar types. |
In the following example, we display today's date in different time zones.
#include <iostream>
#include <JLC/JLC.h>
using namespace JLC;
using namespace calendar::timezone;
int main(){
const Date today = Date::now();
std::cout << "Local = " << (today & LTZ) << std::endl;
std::cout << "London = " << (today & UTC) << std::endl;
std::cout << "New York = " << (today & UTC-500) << std::endl;
std::cout << "Tehran = " << (today & UTC+330) << std::endl;
std::cout << "Sydney = " << (today & UTC+1000) << std::endl;
}Local = 2020-06-19T14:02:27+0200
London = 2020-06-19T12:02:27+0000
New York = 2020-06-19T07:02:27-0500
Tehran = 2020-06-19T15:32:27+0330
Sydney = 2020-06-19T22:02:27+1000