Ptime has platform independent POSIX time support in pure OCaml. It
provides a type to represent a well-defined range of POSIX timestamps
with picosecond precision, conversion with date-time values,
conversion with [RFC 3339 timestamps][rfc3339] and pretty printing to
a human-readable, locale-independent representation.
The additional Ptime_clock library provides access to a system POSIX
clock and to the system's current time zone offset.
Ptime is not a calendar library.
Ptime has no dependency. Ptime_clock depends on your system library or
under the ISC license.
Home page: http://erratique.ch/software/ptime