Difference between revisions of "cpp/header/ctime"
From cppreference.com
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size_t strftime(char* s, size_t maxsize, const char* format, const struct tm* timeptr); | size_t strftime(char* s, size_t maxsize, const char* format, const struct tm* timeptr); | ||
} | } | ||
| + | }} | ||
| + | ===Class {{lc|std::timespec}}=== | ||
| + | {{source|1= | ||
| + | struct timespec { | ||
| + | std::time_t tv_sec; | ||
| + | long tv_nsec; | ||
| + | }; | ||
}} | }} | ||
{{langlinks|zh}} | {{langlinks|zh}} | ||
Revision as of 21:26, 6 December 2017
This header was originally in the C standard library as <time.h>.
This header is part of the C-style date and time library.
Contents |
Macro Constants
| number of processor clock ticks per second (macro constant) | |
| implementation-defined null pointer constant (macro constant) |
Types
| process running time (typedef) | |
| unsigned integer type returned by the sizeof operator (typedef) | |
| time since epoch type (typedef) | |
| calendar time type (class) | |
| (C++17) |
time in seconds and nanoseconds (struct) |
Functions
Time manipulation | |
| returns raw processor clock time since the program is started (function) | |
| returns the current time of the system as time since epoch (function) | |
| computes the difference between times (function) | |
| (C++17) |
returns the calendar time in seconds and nanoseconds based on a given time base (function) |
Format conversions | |
| converts a std::time_t object to a textual representation (function) | |
| converts a std::tm object to a textual representation (function) | |
| converts a std::tm object to custom textual representation (function) | |
| converts a std::tm object to custom wide string textual representation (function) | |
| converts time since epoch to calendar time expressed as Universal Coordinated Time (function) | |
| converts time since epoch to calendar time expressed as local time (function) | |
| converts calendar time to time since epoch (function) | |
Synopsis
#define NULL /* see definition */ #define CLOCKS_PER_SEC /* see definition */ #define TIME_UTC /* see definition */ namespace std { using size_t = /* see definition */; using clock_t = /* see definition */; using time_t = /* see definition */; struct timespec; struct tm; clock_t clock(); double difftime(time_t time1, time_t time0); time_t mktime(struct tm* timeptr); time_t time(time_t* timer); int timespec_get(timespec* ts, int base); char* asctime(const struct tm* timeptr); char* ctime(const time_t* timer); struct tm* gmtime(const time_t* timer); struct tm* localtime(const time_t* timer); size_t strftime(char* s, size_t maxsize, const char* format, const struct tm* timeptr); }
Class std::timespec
struct timespec { std::time_t tv_sec; long tv_nsec; };
