21 Date and Time

This chapter describes functions for manipulating dates and times, including functions for determining what time it is and conversion between different time representations.

• Time Basics: Concepts and definitions.
• Elapsed Time: Data types to represent elapsed times
• Processor And CPU Time: Time a program has spent executing.
• Calendar Time: Manipulation of ``real'' dates and times.
• Setting an Alarm: Sending a signal after a specified time.
• Sleeping: Waiting for a period of time.