How to Parse Date Strings into C 11 Temporal Values?

Parsing Date Strings into C 11 Temporal Values

Date String Parsing

Given a historical date string in the format "Thu Jan 9 12:35:34 2014", the goal is to parse it into a suitable C representation.

C 11 std::chrono Approach

For the C 11 std::chrono namespace, a combination of the std::strptime function and std::chrono::system_clock can be utilized.

std::tm tm = {};
std::stringstream ss("Jan 9 2014 12:35:34");
ss >> std::get_time(&tm, "%b %d %Y %H:%M:%S");
auto tp = std::chrono::system_clock::from_time_t(std::mktime(&tm));

Note that std::get_time is not implemented in GCC prior to version 5.

Alternative Option

An alternative approach is to use the strptime function:

std::tm tm = {};
strptime("Thu Jan 9 2014 12:35:34", "%a %b %d %Y %H:%M:%S", &tm);
auto tp = std::chrono::system_clock::from_time_t(std::mktime(&tm));

Duration Calculation

Once the date string is parsed into a temporal value, the difference between the current time and the parsed time can be calculated using std::chrono::duration. This duration provides access to the number of seconds, minutes, hours, and days elapsed.

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