Date and time utilities
Functions
Time manipulation |
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Defined in header <time.h> |
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| computes the difference between times (function) |
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| returns the current calendar time of the system as time since epoch (function) |
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| returns raw processor clock time since the program is started (function) |
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(C11) | returns the calendar time in seconds and nanoseconds based on a given time base (function) |
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(C23) | returns the resolution of calendar time based on a given time base (function) |
Format conversions |
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Defined in header <time.h> |
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(deprecated in C23)(C11) | converts a tm object to a textual representation (function) |
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(deprecated in C23)(C11) | converts a time_t object to a textual representation (function) |
converts a tm object to custom textual representation (function) |
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Defined in header <wchar.h> |
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(C95) | converts a tm object to custom wide string textual representation (function) |
Defined in header <time.h> |
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(C23)(C11) | converts time since epoch to calendar time expressed as Coordinated Universal Time (UTC) (function) |
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(C23)(C11) | converts time since epoch to calendar time expressed as local time (function) |
| converts calendar time to time since epoch (function) |
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(C23) | converts calendar time to time since epoch, ignoring the Daylight Saving Time flag (function) |
Constants
Defined in header <time.h> |
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| number of processor clock ticks per second (macro constant) |
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Types
Defined in header <time.h> |
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| calendar time type (struct) |
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| calendar time since epoch type (typedef) |
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| processor time since era type (typedef) |
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(C11) | time in seconds and nanoseconds (struct) |
References
- C23 standard (ISO/IEC 9899:2024):
- 7.27 Date and time <time.h> (p: TBD)
- 7.29.5.1 The wcsftime function (p: TBD)
- 7.31.14 Date and time <time.h> (p: TBD)
- C17 standard (ISO/IEC 9899:2018):
- 7.27 Date and time <time.h> (p: 284-291)
- 7.29.5.1 The wcsftime function (p: 320-321)
- 7.31.14 Date and time <time.h> (p: 333)
- C11 standard (ISO/IEC 9899:2011):
- 7.27 Date and time <time.h> (p: 388-397)
- 7.29.5.1 The wcsftime function (p: 439-440)
- 7.31.14 Date and time <time.h> (p: 456)
- C99 standard (ISO/IEC 9899:1999):
- 7.23 Date and time <time.h> (p: 338-347)
- 7.24.5.1 The wcsftime function (p: 385-386)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.12 DATE AND TIME <time.h>
See also
| C++ documentation for C Date and time utilities |
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