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Extract timezone offset from timezone conversion functions

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Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
This commit is contained in:
Vladislav Shchapov 2022-12-10 15:23:49 +05:00 committed by Victor Zverovich
parent 1bf302a4ea
commit c06e0b4ede
1 changed files with 9 additions and 21 deletions
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30
include/fmt/chrono.h
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@ -427,33 +427,14 @@ inline void do_write(buffer<Char>& buf, const std::tm& time,
os.imbue(loc);
using iterator = std::ostreambuf_iterator<Char>;
const auto& facet = std::use_facet<std::time_put<Char, iterator>>(loc);
// std::time_put may not support '%Ez', '%Oz'.
bool modified_z = false;
if (format == 'z' && modifier != '\0') {
modified_z = true;
modifier = '\0';
}
auto end = facet.put(os, os, Char(' '), &time, format, modifier);
if (end.failed()) FMT_THROW(format_error("failed to format time"));
if (modified_z) {
// Insert ':' into ISO 8601 formatted timezone
auto size = buf.size();
buf.push_back(*(buf.end() - 1));
Char* p = buf.data();
p[size - 1] = p[size - 2];
p[size - 2] = Char(':');
}
}
template <typename Char, typename OutputIt,
FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
auto write(OutputIt out, const std::tm& time, const std::locale& loc,
char format, char modifier = 0) -> OutputIt {
if (format == 'z' && modifier != '\0') {
auto&& buf = basic_memory_buffer<Char>();
do_write<Char>(buf, time, loc, format, modifier);
return copy_str<Char>(buf.begin(), buf.end(), out);
}
auto&& buf = get_buffer<Char>(out);
do_write<Char>(buf, time, loc, format, modifier);
return get_iterator(buf, out);
@ -1274,8 +1255,15 @@ class tm_writer {
}
write_utc_offset(-offset, ns);
#else
ignore_unused(tm);
format_localized('z', ns == numeric_system::standard ? '\0' : 'E');
if (ns == numeric_system::standard) return format_localized('z');
// Extract timezone offset from timezone conversion functions.
std::tm gtm = tm;
std::time_t gt = std::mktime(&gtm);
std::tm ltm = gmtime(gt);
std::time_t lt = std::mktime(&ltm);
long offset = gt - lt;
write_utc_offset(offset, ns);
#endif
}