| Defined in header <locale> | ||
|---|---|---|
public: dateorder date_order() const; | (1) | |
protected: virtual dateorder do_date_order() const; | (2) |
1) Public member function, calls the protected virtual member function
do_date_order of the most derived class. 2) Returns a value of type
std::time_base::dateorder, which describes the default date format used by this locale (expected by get_date() and produced by std::strftime() with format specifier '%x').The valid values (inherited from std::time_base) are:
no_order | the format contains variable items (week day, Julian day, etc), or this function is not implemented |
dmy | day, month, year (European locales) |
mdy | month, day, year (American locales) |
ymd | year, month, day (Asian locales) |
ydm | year, day, month (rare) |
Parameters
(none).
Return value
A value of type dateorder.
Notes
This function is optional, it may return no_order in every case.
Example
#include <iostream>
#include <locale>
void show_date_order()
{
std::time_base::dateorder d = std::use_facet<std::time_get<char>>(
std::locale()
).date_order();
switch (d)
{
case std::time_base::no_order: std::cout << "no_order\n"; break;
case std::time_base::dmy: std::cout << "day, month, year\n"; break;
case std::time_base::mdy: std::cout << "month, day, year\n"; break;
case std::time_base::ymd: std::cout << "year, month, day\n"; break;
case std::time_base::ydm: std::cout << "year, day, month\n"; break;
}
}
int main()
{
std::locale::global(std::locale("en_US.utf8"));
std::cout << "In U.S. locale, the default date order is: ";
show_date_order();
std::locale::global(std::locale("ja_JP.utf8"));
std::cout << "In Japanese locale, the default date order is: ";
show_date_order();
std::locale::global(std::locale("de_DE.utf8"));
std::cout << "In German locale, the default date order is: ";
show_date_order();
}Output:
In U.S. locale, the default date order is: month, day, year In Japanese locale, the default date order is: year, month, day In German locale, the default date order is: day, month, year
See also
| [virtual] | extracts month, day, and year from input stream (virtual protected member function) |
| defines date format constants (class) |
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