How to Convert a Time String to `time_t` in C ?

Conversion of Time from String to time_t in C

In C , you can encounter scenarios where a string variable stores time in a specific format, such as "hh:mm:ss". To process and use this time effectively, it's often necessary to convert it into the time_t type. This conversion allows you to work with the time in a standard and versatile manner.

Conversion Process:

C 11 introduced a convenient way to perform this conversion using the std::get_time function:

struct std::tm tm;
std::istringstream ss("16:35:12"); // Initialize the stringstream with your time string
ss >> std::get_time(&tm, "%H:%M:%S"); // Parse the time using strftime's format
std::time_t time = std::mktime(&tm); // Convert the parsed tm struct to time_t

Time Comparison:

Once you have converted both time strings into time_t types, you can easily compare them to determine which one represents an earlier time. Here's how you can do it:

std::time_t curr_time_t; // Convert your current time string to time_t
std::time_t user_time_t; // Convert your user time string to time_t

if (curr_time_t < user_time_t) {
  // curr_time is earlier than user_time
} else if (curr_time_t > user_time_t) {
  // user_time is earlier than curr_time
} else {
  // curr_time and user_time are the same
}

Using these methods, you can efficiently convert time strings to time_t types and compare times in C to meet your specific application needs.

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