# std::chrono::choose

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< cpp‎ | chrono

Defined in header `<chrono>` |  |
enum class choose { earliest, latest }; |  | (since C++20)

The scoped enumeration `choose` can be passed to certain member functions of std::chrono::time_zone and std::chrono::zoned_time to control how ambiguous or nonexistent local times should be resolved. Passing `choose::earliest` causes the earlier time point to be returned, while passing `choose::latest` causes the later time point to be returned. (For nonexistent local times, these two time points are identical.)

If a `choose` is not passed and an ambiguous or nonexistent local time is encountered, a std::chrono::ambiguous_local_time or std::chrono::nonexistent_local_time exception (as applicable) will be thrown.

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