Hello,
It looks like Cygwin implementation of strptime(3) cannot understand the "%s"
format (seconds since Jan 1, 1970 UTC), which strftime() can.
When I test the same code of Linux, it appears to work correctly.
Cygwin:
$ gcc -Wall -o timetest timetest.c
$ ./timetest
1500755837 -> 1500755837
Cannot convert string
Linux:
$ gcc -Wall -o timetest timetest.c
$ ./timetest
1500755887 -> 1500755887
1500755887 -> 1500755887, unconverted: ""
Anton Lavrentiev
Contractor NIH/NLM/NCBI
$ cat timetest.c
#define _XOPEN_SOURCE
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
int main()
{
time_t now = time(0);
struct tm tm = *localtime(&now);
char str[80], *s;
size_t n = strftime(str, sizeof(str), "%s", &tm);
if (!n) {
printf("Cannot convert time");
return 1;
}
assert(n == strlen(str));
printf("%lu -> %s\n", (unsigned long) now, str);
memset(&tm, 0, sizeof(tm));
if (!(s = strptime(str, "%s", &tm))) {
printf("Cannot convert string");
return 1;
}
now = mktime(&tm);
printf("%s -> %lu, unconverted: \"%s\"\n", str, (unsigned long) now, s);
return 0;
}
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