How Can I Implement strptime() Functionality on Windows?

strptime() for Windows

strptime() is a POSIX function that is commonly used to parse text strings into tm structures. Unfortunately, this function is not available on Windows.

Alternative Implementations

If you are looking for a good equivalent implementation of strptime() for Windows, here is a solution that utilizes the sscanf, struct tm, and mktime functions:

1. Parse the date using sscanf.
2. Copy the integers into a struct tm, adjusting for the fact that months are 0-indexed and years start in 1900.
3. Finally, use mktime to obtain a UTC epoch integer.

Remember to set the isdst member of the struct tm to -1 to avoid daylight savings issues.

Example

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
    char *date_str = "MM-DD-YYYY HH:MM:SS";

    struct tm tm;
    sscanf(date_str, "%d-%d-%d %d:%d:%d", &tm.tm_mon, &tm.tm_mday, &tm.tm_year, &tm.tm_hour, &tm.tm_min, &tm.tm_sec);

    tm.tm_mon -= 1;  // Adjust for zero-indexing
    tm.tm_year -= 1900;  // Adjust for 1900 starting year

    time_t epoch = mktime(&tm);

    printf("Epoch: %ld\n", epoch);

    return 0;
}

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