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strptime from time.h Error: "implicit declaration of function 'strptime'; did you mean 'strftime'? [-Wimplicit-function-declaration]"

erumed

Hi!

I want to use the function strptime from time.h to convert a timestamp to unix time but get the error "implicit declaration of function 'strptime'; did you mean 'strftime'? [-Wimplicit-function-declaration]". 

I am using nrf9160dk_nrf9160ns and NCS v1.5.0. And when I google the problem, it says that not all compiler have that function in time.h. Which compiler is use, is it gcc?

main.c:

#include <zephyr.h>
#include <sys/printk.h>
#include <drivers/uart.h>
#include <string.h> 
#include <time.h>
#include "SEGGER_RTT.h" 

void main(void) 
{
    struct tm tm;
    time_t unixtime;

    strptime("Wed, 07 Dec 2021 12:14:46 GMT","%a, %e %h %Y %H:%M:%S %Z", &tm);
    
    unixtime = mktime(&tm);
    SEGGER_RTT_printf(0, "%d\n",unixtime);
}

Is there any function to easily do the convert?

Thanks! /Ellinor

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