Chronos

Time library for haskell. The main differences between this and time are that this library:

Uses machine integers where possible. This means that some time-related arithmetic should be faster. It also means that the types are incapable of representing times that are very far in the future or the past.
Provides ToJSON and FromJSON instances.
Uses normal non-overloaded haskell functions for encoding and decoding time. It provides attoparsec parsers for both Text and ByteString. Additionally, it provides functions for encoding time as Text or ByteString. The time library uses accomplishes these with the Data.Time.Format module, which uses UNIX-style datetime format strings. It is expected that the approach taken in this library is faster at the cost of being less expressive.
Only provides nanosecond resolution instead of picosecond resolution.

Benchmarks

chronos library performance is compared with time and thyme.