# Posix Time System Documentation

Overall Index -- Gregorian Index

Temporal Types

Class ptime -- Class time_duration -- Class time_period

Other Topics

Time Iterators -- UTC / Local Time Adjustments

## Introduction

Defines a non-adjusted time system with nano-second resolution and stable calculation properties. This time system uses the Gregorian calendar to implement the date portion of the time representation.

## Usage Examples

Example | Description
Time Math | A few simple calculations using ptime and time_durations.
Print Hours | Retrieve time from clock, use a time_iterator.
Local to UTC Conversion | Demonstrates a couple different ways to convert a local to UTC time including daylight savings rules.
Time periods | Some simple examples of intersection and display of time periods.