How to Convert a String Time to time_t in C ?

Converting String Time to time_t in C

When working with time data in C , it's often necessary to convert strings containing time in the "hh:mm:ss" format to the time_t type. Here's how you can achieve this:

#include <iostream>
#include <iomanip>
#include <sstream>
#include <ctime>

int main() {
  std::string time_details = "16:35:12";
  
  struct std::tm tm;
  std::istringstream ss(time_details);
  ss >> std::get_time(&tm, "%H:%M:%S"); // or use "%T" for this case
  std::time_t time_value = std::mktime(&tm);

  std::cout << "Converted time: " << std::put_time(std::gmtime(&time_value), "%H:%M:%S") << '\n';

  return 0;
}

This code demonstrates:

• Converting to time_t: We convert the string time to a time_t variable named time_value using stream parsing of the string and the std::mktime function.

• Comparing Time Variables: To compare two time_t variables (e.g., curr_time and user_time), you can use the following method:

  if (curr_time < user_time) {
  std::cout << "curr_time is earlier than user_time.\n";
  } else if (curr_time == user_time) {
  std::cout << "curr_time and user_time are the same.\n";
  } else {
  std::cout << "user_time is earlier than curr_time.\n";
  }

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