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This article is written like a manual or guide. Please help rewrite this article and remove advice or instruction. (October 2014)

C standard library (libc)
General topics
Data types Character classification Strings Mathematics File input/output Date/time Localization Memory allocation Process control Signals Alternative tokens
Miscellaneous headers
<assert.h> <errno.h> <setjmp.h> <stdarg.h>
v t e

The C date and time functions are a group of functions in the standard library of the C programming language implementing date and time manipulation operations.^[1] They provide support for time acquisition, conversion between date formats, and formatted output to strings.

^ ISO/IEC 9899:1999 specification (PDF). p. 351, § 7.32.2.