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Showing content from https://cplusplus.com/reference/locale/time_get/get_date/ below:

public member function

<locale>

iter_type get_date (iter_type s, iter_type end, ios_base& str,                    ios_base::iostate& err, tm* t) const;

Read date

The function reads characters until the character read cannot be part of a valid date sequence expression or end is reached. The next character in the sequence is pointed by the iterator returned by the function.

If successful, the function sets the relevant members of the tm structure t. The remaining members are left unchanged.

Internally, this function simply calls the virtual protected member

, which by default parses characters following the same format produced by

in

.

The function updates err with the result of the operation if necessary:

- If the format of the sequence is not valid, the function sets

.

- Otherwise, it is unspecified, although some implementations set

to

if the function exhausts the sequence of characters (i.e., it reaches

, both in case of success and failure), or to

otherwise.

Internally, this function simply calls the virtual protected member

, which by default parses characters following the a format that depends on the value returned by member

:

The function updates

with the result of the operation if necessary:

- If the format of the sequence is not valid, the function sets

.

- If the function exhausts the sequence of characters (i.e., it reaches

) during its operations, it sets

(both

and

may be set by a single operation).

- Otherwise, it is unspecified, although some implementations set

to

.

s, end

Iterators pointing to the beginning and ending characters of the sequence. The range used is [s,end), which contains all the characters between s and end, including the character pointed by s but not the character pointed by end.
Member type iter_type is the facet's iterator type (defined as an alias of time_get's second template parameter, InputIterator). By default, this is an istreambuf_iterator, allowing implicit conversions from basic_istream objects.

str

Object of a class derived from ios_base (generally an input stream object). It is only used to obtain formatting information.

err

Stream error state object, of type ios_base::iostate where the error states are stored.

t

Pointer to an object of type struct tm (defined in header <ctime>), whose members are set by a successful call to this member function.

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// time_get::get_date example
#include <iostream>       // std::cout, std::ios
#include <sstream>        // std::istringstream
#include <ctime>          // std::tm
#include <locale>         // std::locale, std::time_get, std::use_facet

int main ()
{
  std::locale loc;        // classic "C" locale

  // get time_get facet:
  const std::time_get<char>& tmget = std::use_facet <std::time_get<char> > (loc);

  std::ios::iostate state;
  std::istringstream iss ("01/02/03");
  std::tm when;

  tmget.get_date (iss, std::time_get<char>::iter_type(), iss, state, &when);

  std::cout << "year: " << when.tm_year << '\n';
  std::cout << "month: " << when.tm_mon << '\n';
  std::cout << "day: " << when.tm_mday << '\n';
  return 0;
}

time_get::get_time

Read time (public member function)

time_get::get_weekday

Read weekday (public member function)

time_get::get_monthname

Read month name (public member function)

time_put::put

Write time and date (public member function)

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