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## 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.