16/7/11_php-getting the current UNIX timestamp

Gets the current UNIX timestamp

The UNIX timestamp (called: timestamp) is a very important concept in PHP for time and date, which represents the sum of the seconds from January 1, 1970 00:00:00 to the current time.

PHP provides a built-in function time () to get the timestamp of the current time of the server. It is easy to get the current UNIX timestamp.

$time = time (); Echo $time;//1396193923, this number represents 1,396,193,923 seconds from January 1, 1970 00:00:00 When I output this script.

Get the current date

PHP has a date () function built into it to get the current day.

Function Description: Date (timestamp format, specified timestamp "default is the current date and time, optional")

Return value: function date and time

Example:

The date function, the second parameter takes the default value in the case of Echo date ("y-m-d"), the//2014-03-30//date function, the second argument has the value of the case of the Echo date ("y-m-d", ' 1396193923 ');// 2014-03-30,1396193923 represents the Unix timestamp for 2014-03-30

Unix timestamp of date acquired

The UNIX timestamp (called: timestamp) is a very important concept in PHP for time and date, which represents the sum of the seconds from January 1, 1970 00:00:00 to the current time.

PHP provides built-in function Strtotime implementations: Gets the timestamp of a date, or gets the timestamp of a time. For example:

echo strtotime (' 2014-04-29 ');//1398700800, this figure represents 1,398,700,800 seconds from January 1, 1970 00:00:00 to April 29, 2014. Echo strtotime (' 2014-04-29 00:00:01 ');//1398700801, this number means it's been 1,398,700,801 seconds since January 1, 1970 00:00:00 to 2014-04-29 00:00:01. Have you found the pattern? In fact strtotime (' 2014-04-29 ') is equivalent to Strtotime (' 2014-04-29 00:00:00 ')

Converts a formatted date string to a Unix timestamp

The Strtotime function expects to accept a string containing the U.S. English date format and attempt to resolve it to a Unix timestamp.

Function Description: Strtotime (time string to parse, calculates the timestamp of the return value "default is the current time, optional")
Return value: Success returns timestamp, otherwise FALSE

Like what

Echo Strtotime ("Now"), or//is equivalent to the current date and time of the English word, and converts the date time to a Unix timestamp. This effect is the same as echo time (). Echo strtotime ("+1 seconds") is equivalent to adding the current date and time to 1 seconds and converting the date time to a Unix timestamp. This effect is the same as echo time () +1. Echo strtotime ("+1 Day"), or the equivalent of adding the current date and time to 1 days. Echo strtotime ("+1 Week");//equivalent to the current date and time is added 1 weeks. Echo strtotime ("+1 Week 3 days 7 hours 5 Seconds"), or//equivalent to the current date and time is added 1 Weeks 3 day 7 hours 5 seconds.

Format Greenwich (GMT) Standard Time

The Gmdate function can format a GMT date and time, returning Greenwich Mean Time (GMT).

For example, we are now in the China time Zone is East eight, leading GMT 8 hours, sometimes called gmt+8, then the server run the following script to return the time should be this: the current time is assumed to be 2014-05-01 15:15:22echo date (' y-m-d H: I:s ', Time ()); The output is: 2014-05-01 15:15:22 echo gmdate (' y-m-d h:i:s ', Time ()); The output is: 2014-05-01 07:15:22 because GMT is now in China time zone minus 8 hours, so compared to the present time is less than 8 hours

16/7/11_php-getting the current UNIX timestamp