How to convert year, month and day to timestamp in php

Method for converting year, month and day to timestamp: 1. Use the date_parse_from_format() function to process a given date. An associative array containing the specified date information will be returned according to the specified format. The syntax is "date_parse_from_format('Y.m.d ', date)"; 2. Use the "mktime(0,0,0,$arr['month'],$arr['day'],$arr['year']);" statement to convert the year, month and day Just a timestamp.

The operating environment of this article: windows7 system, PHP8 version, DELL G3 computer

PHP specified date to timestamp

Use date_parse_from_format to convert the specified format: For example:

<?php
$str = &#39;2018.10.01&#39;;//或者 2018年10月1日
$arr = date_parse_from_format(&#39;Y.m.d&#39;,$str);//如果是2018年10月1日,那么这里就是 Y年m月d日
$time = mktime(0,0,0,$arr[&#39;month&#39;],$arr[&#39;day&#39;],$arr[&#39;year&#39;]);
print_r($arr);
echo &#39;对应时间戳为：&#39;.$time;

Output:

Array ( [year] => 2018 [month] => 10 [day] => 1 [hour] => [minute] => [second] => [fraction] => [warning_count] => 0 [warnings] => Array ( ) [error_count] => 0 [errors] => Array ( ) [is_localtime] => )
 对应时间戳为：1538352000

mktime() definition and usage

## The #gmmktime() function returns the UNIX timestamp of a date.

Tip: This function is the same as gmmktime(), except that the parameter passed represents a date (instead of a GMT date).

Syntax

mktime(hour,minute,second,month,day,year,is_dst);

year Optional. Specified year.

ParametersDescriptionhourOptional. Specified hours. minuteOptional. prescribed points. secondOptional. Specifies seconds. monthOptional. Specified month. day Optional. Specify days. is_dst

	Optional. Set to 1 if the time is during Daylight Saving Time (DST), 0 otherwise, or -1 (default) if unknown. If unknown, PHP will do the search itself (which may produce unexpected results). Note: This parameter is deprecated in PHP 5.1.0. Instead, new time zone handling features are used.

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