How to convert date to timestamp in php?

Conversion method: 1. Use the strtotime() function to convert the date represented by the English text string into a timestamp, the syntax is "strtotime (date/time string)"; 2. Use the mktime() function, Convert the specified date to a timestamp, the syntax is "mktime(hour, minute, second, month, day, year)".

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Convert date to timestamp

PHP provides functions that can easily convert various forms of dates into timestamps. The main functions of this type are:

• strtotime(): Parse any English text datetime description into a timestamp.

• mktime(): Get timestamp from date.

strtotime()

strtotime() function is used to convert the date represented by the English text string into time Stamp, the inverse function of date(), returns the timestamp successfully, otherwise returns FALSE.

Syntax:

int strtotime ( string time [, int now] )

The parameter time is the parsed string, which is the date represented according to the GNU date input format.

Example:

<?php
echo strtotime("2009-10-21 16:00:10")."<br>";
//输出 1256112010
echo strtotime("10 September 2008")."<br>";
//输出 1220976000
echo strtotime("+1 day");
//输出明天此时的时间戳
?>

mktime()

mktime() function is used to get the timestamp from the date and returns successfully Timestamp, otherwise returns FALSE.

Syntax:

int mktime(时, 分, 秒, 月, 日, 年)

Example:

<?php
echo mktime(21, 50, 55, 07, 14, 2010);
//输出“1279115455”
?>

Parameters can be omitted from right to left, and any omitted parameters will be set to the current value of the local date and time.

mktime() is useful for doing date calculations and validation, it will automatically calculate the correct value for out-of-range input. For example, the following examples output 2020-01-01:

<?php
echo date("Y-m-d", mktime(0, 0, 0, 12, 32, 2019));
echo date("Y-m-d", mktime(0, 0, 0, 13, 1, 2019));
?>

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