Modifier for timezone offset result in compile error

[dgnthr]

Hi,

I'm currently trying to print ISO8601 compatible time strings.

As per the specification I can print the timezone offset to UTC with the "%z" conversion specifier. This should for example print "+0100". Using the modifier E or O as in "%Ez" should print "+01:00". If I use either modifier I get a compile time exception FMT_THROW(format_error("invalid format"));

The example code I use is

#include <chrono>
#include <fmt/chrono.h>

int main() {
    auto time = std::time(0);
    auto LocalTime = std::localtime(&time);
    fmt::print("{:%z}\n", *LocalTime);
    fmt::print("{:%Oz}\n", *LocalTime);

    return 0;
}

Also see the example on compiler explorer https://godbolt.org/z/9cEvzKPn9

Am I doing something wrong? Thank you for your time!

[dgnthr]

I just checked the source code and saw that the modifiers (E, O) are not implemented for %z. I'll just use it without the colon.

[phprus]

Modifiers (E, O) are not defined for %z format:
https://en.cppreference.com/w/cpp/chrono/c/strftime

[dgnthr]

I was referencing this https://en.cppreference.com/w/cpp/chrono/duration/formatter (close to the bottom).

The modified commands %Ez and %Oz insert a : between the hours and minutes (e.g., -04:30).

[phprus]

@dgnthr
PR: #3222

[dgnthr]

Wow! Amazingly fast. Thank you so much!