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Reference.org
C date and time functions
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<p>The C date and time functions are a group of functions in the <a href="/facts/C_standard_library/qdG1nW2c">standard library</a> of the <a href="/facts/C_/Ky2No763">C programming language</a> implementing date and time manipulation operations. They provide support for <a href="/facts/System_time/LtoSMX4v">time</a> acquisition, conversion between date formats, and formatted output to strings. </p>