#include <time.h>
#include <string.h>

// Parse a time string "YYYY-MM-DD HH:MM:SS" into struct tm
struct tm parseTime(const char *timeStr) {
    struct tm t = {0};
    sscanf(timeStr, "%d-%d-%d %d:%d:%d", &t.tm_year, &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min, &t.tm_sec);
    t.tm_year -= 1900; // Adjust year
    t.tm_mon -= 1;     // Adjust month
    return t;
}

// Calculate duration between two time strings
void calculateDuration(const char *currentTimeStr, const char *pastTimeStr) {
    struct tm currentTm = parseTime(currentTimeStr); // Temporary variable for current time
    struct tm pastTm = parseTime(pastTimeStr);       // Temporary variable for past time

    time_t current = mktime(&currentTm);
    time_t past = mktime(&pastTm);

    if (current == -1 || past == -1) {
        Serial.println("Error: Invalid time conversion.");
        return;
    }

    int seconds = difftime(current, past);
    Serial.printf("Duration: %d days, %d hours, %d minutes, %d seconds\n", 
                  seconds / 86400, (seconds % 86400) / 3600, (seconds % 3600) / 60, seconds % 60);
}

void setup() {
    Serial.begin(115200);
    calculateDuration("2024-12-27 12:00:00", "2023-12-20 14:30:00");
}

void loop() {
    // Your code here
}