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omochimetaru 6/26/2019 7:32 AM
https://github.com/apple/swift-corelibs-foundation/blob/master/Foundation/Date.swift#L20
apple/swift-corelibs-foundation
The Foundation Project, providing core utilities, internationalization, and OS independence - apple/swift-corelibs-foundation
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7:33 AM
public struct Date : ReferenceConvertible, Comparable, Equatable { fileprivate var _time: TimeInterval }
7:35 AM
Doubleの精度はおよそ15桁だから、 1970から50年で 1,576,800,000秒で10桁使うから
7:36 AM
ミリ秒3桁までは13桁でいけそうだけど
7:36 AM
マイクロ秒6桁になるとギリギリアウトぐらいか