2025年1月10日 · The time() function is defined in time.h (ctime in C++) header file. This function returns the time since 00:00:00 UTC, January 1, 1970 (Unix timestamp) in seconds. If second is not a null pointer, the returned value is also stored in the object pointed to by second.

C 库函数 time_t time(time_t *seconds) 返回自纪元 Epoch（1970-01-01 00:00:00 UTC）起经过的时间，以秒为单位。 如果 seconds 不为空，则返回值也存储在变量 seconds 中。

The C library time() function returns the time since the Epoch (00:00:00 UTC, January 1, 1970), measured in seconds. If seconds is not NULL, the return value is also stored in variable seconds. In context of time() function, Epoch determine the timestamp value which is date and time.

I want to get the current time of my system. For that I'm using the following code in C: time_t now; struct tm *mytime = localtime(&now); if ( strftime(buffer, sizeof buffer, "%X", mytime) ) ...

Get the current calendar time as a value of type time_t. The function returns this value, and if the argument is not a null pointer , it also sets this value to the object pointed by timer . The value returned generally represents the number of seconds since 00:00 hours, Jan 1, 1970 UTC (i.e., the current unix timestamp ).

2016年8月2日 · The standard C library provides the time function and it is useful if you only need to compare seconds. If you need millisecond precision, though, the most portable way is to call timespec_get . It can tell time up to nanosecond precision, if the system supports.

This header file contains definitions of functions to get and manipulate date and time information.

2025年2月23日 · The time() function in C retrieves the current calendar time, typically expressed as the number of seconds elapsed since the Unix Epoch (00:00 hours, Jan 1, 1970 UTC). It is extensively used for generating timestamps, measuring time intervals, and in various time-related operations within programs.

2023年12月27日 · Thankfully, C offers a flexible set of date/time functions, with time () being one of the most ubiquitous for interfacing with system clocks, timestamps, and timing operations. In this comprehensive guide, I‘ll provide expert techniques for leveraging time () like a C wizard to meet all your timing needs!

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