CODEWITHSUNDEEP
c++datetime
Igor Ryzhov
Igor Ryzhov

Reputation: 181

C++ datetime parse

I use strptime to parse datetime string into tm structure. But I faced a problem:

I have date in this format:

Thu Dec 13 23:44:45 MSK 2012

I parse Thu Dec 13 23:44:45 with "%a %b %d %T" format string. But I can't understand how to parse year. I can't just use "%a %b %d %T MSK %Y" because I want locale-independent parser.

Can I just skip MSK word? Or any other way to solve the problem?

Upvotes: 3

Views: 2410

Answers (1)

Igor Ryzhov
Igor Ryzhov

Reputation: 181

I didn't find an answer, so I wrote my own datetime parser:

time_t timeParse(const char *string, struct tm *datetime)
{
    char dn[4], mn[4], ln[4];
    int d, h, m, s, y;
    sscanf(string, "%s %s %d %d:%d:%d %s %d", dn, mn, &d, &h, &m, &s, ln, &y);
    datetime->tm_sec = s;
    datetime->tm_min = m;
    datetime->tm_hour = h;
    datetime->tm_mday = d;
    if (!strcmp(mn, "Jan")) datetime->tm_mon = 0;
    if (!strcmp(mn, "Feb")) datetime->tm_mon = 1;
    if (!strcmp(mn, "Mar")) datetime->tm_mon = 2;
    if (!strcmp(mn, "Apr")) datetime->tm_mon = 3;
    if (!strcmp(mn, "May")) datetime->tm_mon = 4;
    if (!strcmp(mn, "Jun")) datetime->tm_mon = 5;
    if (!strcmp(mn, "Jul")) datetime->tm_mon = 6;
    if (!strcmp(mn, "Aug")) datetime->tm_mon = 7;
    if (!strcmp(mn, "Sep")) datetime->tm_mon = 8;
    if (!strcmp(mn, "Oct")) datetime->tm_mon = 9;
    if (!strcmp(mn, "Nov")) datetime->tm_mon = 10;
    if (!strcmp(mn, "Dec")) datetime->tm_mon = 11;
    datetime->tm_year = y - 1900;
    return mktime(datetime);
}

I fill necessary tm structure fields manually and mktime fills remaining fields: tm_wday, tm_yday, tm_isdst.

You should call it this way:

time_t t = timeParse("Thu Dec 13 23:44:45 MSK 2012", &datetime);

Upvotes: 3

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