unix2isodate.c

Go to the documentation of this file.

#include <timeutils.h>
#include <genutils.h>
 
char * unix2isodate(double dtime, char zone) {
    struct tm *ts;
    time_t itime;
    static char string[30];
    static char tzone[4];
 
    if(dtime == BAD_FLT) {
        return "Undefined time";
    }
 
    itime = (time_t) dtime;
    switch (zone) {
    case 'G':
        ts = gmtime(&itime);
        break;
    case 'L':
        ts = localtime(&itime);
        break;
    default:
        fprintf(stderr, "-W- %s line %d: ", __FILE__, __LINE__);
        fprintf(stderr, "Bad timezone argument passed to unix2isodate().\n");
        exit(EXIT_FAILURE);
    }
    // Add 0.0005 to correct for round off error JMG (08/03/2009)
    // Check for fracSec == 1000 JMG (02/05/2012)
    int fracSec = floor(1000 * (dtime - itime) + 0.0005);
    if (fracSec == 1000) {
        fracSec = 0;
        ts->tm_sec += 1;
    }
 
    sprintf(string, "%d-%02d-%02dT%02d:%02d:%02d.%03.0f", ts->tm_year + 1900, ts->tm_mon + 1,
            ts->tm_mday, ts->tm_hour, ts->tm_min, ts->tm_sec, (float) fracSec);
 
    switch (zone) {
    case 'G':
        strcat(string, "Z");
        break;
    case 'L':
        sprintf(tzone, "%+03d", (int) ts->tm_gmtoff / 3600);
        strcat(string, tzone);
        break;
    default:
        fprintf(stderr, "-W- %s line %d: ", __FILE__, __LINE__);
        fprintf(stderr, "Bad timezone argument passed to unix2isodate().\n");
        exit(EXIT_FAILURE);
    }
 
    return (string);
}
 
double isodate2unix(const char *isodate) {
    struct tm trec = {0};
    strptime(isodate, "%Y-%m-%dT%H:%M:%S", &trec);
    double secSince = mktime(&trec) - gmt_offset();
    char* ptr = strchr(isodate, '.');
    if (ptr) {
        double fracsecs = atof(ptr);
        secSince += fracsecs;
    }
    return secSince;
}