# std::chrono::zoned_traits

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< cpp‎ | chrono

Defined in header `<chrono>` |  |
template < class TimeZonePtr > struct zoned_traits { }; | (1) | (since C++20)
template <> struct zoned_traits<const std::chrono::time_zone*>; | (2) | (since C++20)

The class `zoned_traits` provides a way to customize the behavior of the constructors of std::chrono::zoned_time with custom time zone pointer types. In particular, it allows such types to specify the default time zone to use and the mapping of a time zone's name to the corresponding time zone pointer. It is acceptable for custom time zone pointer types to not support either operation, in which case the corresponding constructors of `zoned_time` will not participate in overload resolution.

The primary template is empty. A specialization is provided for const std::chrono::time_zone*, the default time zone pointer type.

### Member functions

## std::chrono::zoned_traits<const std::chrono::time_zone*>::default_zone

static const std::chrono::time_zone* default_zone(); |  |

Returns a time zone pointer for the default time zone (UTC).

### Return value

std::chrono::locate_zone("UTC").

## std::chrono::zoned_traits<const std::chrono::time_zone*>::locate_zone

static const std::chrono::time_zone* locate_zone(std::string_view name); |  |

Returns the time zone pointer for the time zone designated by `name`.

### Return value

std::chrono::locate_zone(name).

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