Kronos https://github.com/EpicGames/FaceLink/tree/swift-rewrite Kronos is an NTP (Network Time Protocol) client library written in Swift. It supports sub-seconds precision and provides a stable monotonic clock that won't be affected by changes in the clock. https://github.com/lyft/Kronos/blob/master/LICENSE Licensees Git P4 /Engine/Source/ThirdParty/Licenses