PHP conversion of Unix timestamps

Commonly used
1. Convert Unix timestamp into a format similar to "2012-05-12 11:09:15":
date('Y-m-d H:i:s',$time); //$ The value of time is the Unix timestamp, which may be what you took out from the database or...
2. Convert the time in the "2012-05-12" format into a timestamp:
strtotime("2012- 05-12"); //The return value is int type
3. Print the timestamp of the current time:
echo(time());
Advanced
In fact, the date function provided by PHP The function is very easy to use. For example, if you want to convert a Unix timestamp into the date format you want, such as "May 25, 2012":
date('Y year m month d day', $time) ;
You can see that the date function is only interested in "Y", "m", and "d". As for the special characters you inserted in the middle, she doesn't pay much attention.
■Year--"Y" represents the four-digit year. 2012
■Year--"y" represents a two-digit year. 12
■month--"F" means spelling out the English month. January will be displayed as "january"
■month--"M" represents the first 3 characters of the English month. The month of January will be displayed as "jan", the abbreviation of January
■month - "m" represents the numeric month. January is displayed as "01" and December is "12"
■Day--"j" represents a numeric date. If the date is a single digit, "0" will not be added to the high digit, for example: "9", "12"
■Day - "d" represents a numeric date. If the date is a single digit, the high digit will be filled with "0", for example: "09", "12"
■hour - "g" The time in twelve-hour format, if it is a single digit, the high digit will not be filled." 0", for example: "3", "12"
■Hour - "G" is the time in the twenty-four-hour format. If it is a single-digit high digit, "0" will not be added, for example: "3", " 18"
■hour-"h"Twelve-hour time, if it is a single-digit high digit, "0" will be added, for example: "03", "12"
■hour-"H" If the time in the 24-hour format is a single digit, "0" will be added to the high digit, for example: "03", "18"
■ minutes - "i" minutes, for example: "09", "60"
■Seconds--"s" seconds, such as: "06", "60"
Finally, please note that if the time format is output in the twelve-hour format, you need to indicate AM and PM
For example: echo date('g:i:s a');
The output result is: 5:56:57 am
echo date('h:i:s A');
The output result is: 05: 56:57 AM
"a" morning = am, afternoon = pm; "A" morning = AM, afternoon = PM
Popular science
The timestamp is from January 1, 1970 (00:00: 00 GMT). It is also called Unix Timestamp.
Unix timestamp (Unix timestamp), also known as Unix time (Unix time), POSIX time (POSIX time), is a time representation method, defined as starting from 00:00 Greenwich Mean Time on January 1, 1970 The total number of seconds since minute 00 seconds. Unix timestamps are not only used in Unix systems and Unix-like systems, but are also widely used in many other operating systems.

The above introduces PHP's conversion of Unix timestamps, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.