Convert CST Time to GMT

[Shijin Bose]

Is it possible to convert CST to GMT using CCTZ ? How can I do that?

[Greg Miller]

On Mon, Oct 1, 2018 at 5:12 AM Shijin Bose <shiji...@gmail.com> wrote:

Is it possible to convert CST to GMT using CCTZ ? How can I do that?

Yes, though I'm not totally sure exactly what you're asking here. If you mean, that you have a string like "YYYY-mm-dd HH:MM:SS" and that string represents a civil time in, say, America/Chicago[1], and you'd like to see the corresponding time in UTC, you can do something like the following (untested):

std::optional<std::string> convert(const std::string& fmt,

                                   const std::string& input,

                                   cctz::time_zone tz_from,

                                   cctz::time_zone tz_to) {

  std::chrono::system_clock::time_point tp;

  if (!cctz::parse(fmt, input, tz_from, &tp)) return std::nullopt;

  return cctz::format(fmt, tp, tz_to);

}

int main() {

  cctz::time_zone central_tz;

  if (!cctz::load_time_zone("America/Chicago", &central_tz)) return 1;

  auto out = convert("%Y-%m-%d %H:%M:%S", "2018-10-01 01:02:03", central_tz,

                     cctz::utc_time_zone());

  if (!out) return 1;

  std::cout << "Converted time is: " << *out << '\n';

}

HTH,

Greg

[1]: Note that "CST" is not a time-zone identifier. If you mean America/Chicago, use that identifier instead.

 

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