time()

(PHP 4, PHP 5, PHP 7)

返回当前的 Unix 时间戳

说明

返回自从 Unix 纪元（格林威治时间 1970 年 1 月 1 日 00:00:00）到当前时间的秒数。

范例

Example #1time()例子

以上例程的输出类似于：

Now:       2005-03-30
Next Week: 2005-04-06
Next Week: 2005-04-06

注释

自 PHP 5.1 起在$_SERVER['REQUEST_TIME']中保存了发起该请求时刻的时间戳。

参见

• date() 格式化一个本地时间／日期
• microtime() 返回当前 Unix 时间戳和微秒数

The documentation should have this info. The function time() returns always timestamp that is timezone independent (=UTC).

Local time as string can be get by strftime() and local timestamp (if ever needed) by mktime().

Two quick approaches to getting the time elapsed in human readable form. 

The number of 86,400 seconds in a day comes from the assumption of 60 seconds per minute, 60 minutes per hour and 24 hours per day: 60*60*24. But not every day has 24 hours. This edge case occurs on the days that clocks change as we enter and leave daylight savings (summer) time. Date and time arithmetic is logically consistent and correct when you use PHP built-in functions, but it may not always work as expected if you try to write your own date and time arithmetic.

A time difference function that outputs the time passed in facebook's style: 1 day ago, or 4 months ago. I took andrew dot macrobert at gmail dot com function and tweaked it a bit. On a strict enviroment it was throwing errors, plus I needed it to calculate the difference in time between a past date and a future date. 

Below, a function to create TNG-style stardates, taking 2009 to start stardate 41000.0. In fact, the offset is trivial to adjust if you wish to begin from a different date.

Other series use less reliable stardate formats, which makes it difficult [read: nigh impossible] to create a function that converts a unix timestamp into a stardate.

Calculates the difference between $start and $s, returns a formatted string Xd Yh Zm As, e.g. 15d 23h 54m 31s. Empty sections will be stripped, returning 12d 4s, not 12d 0h 0m 4s.
Argument order (begin date, end date) doesn't matter. 

I needed to convert between Unix timestamps and Windows/AD timestamps, so I wrote a pair of simple functions for it. 

If you want to create a "rounded" time stamp, for example, to the nearest 15 minutes use this as a reference: 

A better way to get a nice time-format (1 year ago, 2 months until) without all the trailing months, days, hours, minutes, seconds in the result is by using the DateTime format and using the date_diff function as they both does most of the heavy lifting for you
Function below as example 

It seems that the output of time()> is a few hundred microseconds behind the output of microtime() - be wary of mixing these functions.
Here's a snippet of code that demonstrates the difference: 

Does anyone know if the year 2038 issue will be solved in PHP?
Lets imagine it's year 2039 and the time() function will return negative numbers? This is not acceptable.
Using the DateTime interface is nice, but will these timestamp helper functions be removed or fixed?

I built this function to get the strtotime numbers for the beginning and ending of the month and return them as arrays in an object. Cheers.
    //Returns values in the format of strtotime for evaluating purposes!
    function returnDateFirstAndLast($numberOfMonths) {
      $time=time();
      $lastdayofcurrentmonth=strtotime('+1 month -1 day',strtotime(date('Y-m-1 24:59:59',$time)));
      $values=new stdClass();
      
      for ( $i = 0;$i first=$first;
      $values->last=$last;
      
      return $values;
    }

A method return GMT time (gmttime):

it convert current time to GMT based on time zone offset.
by frank.

elapsed time function with precision: 

Here's one way to generate all intermediate dates (in mySQL format) between any 2 dates. 
Get start and end dates from user input, you'd need to do the basic validations that :
- start and end dates are valid dates 
- start date 
The example above will fetch the current time() in Unix Epoch, convert to your date() and timezone, and covert the result to Unix Epoch again with strtotime() so you can use it to set cookie expiration dates.

This is a very basic and simple function to display either min -OR- hrs and min -OR- days and hrs -OR- days depending on how many seconds are given.
Example use: 

When dealing with the results of the time function, taking the modulus (remainder) is often a good way to find recurring information such as day of the week, week of the year, or month of the year. In the example given below of a firefighter's shift, you could do the following to simplify the code. 

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