How to convert date and time to ymd format in php

Conversion method: 1. Use strtotime() to convert the specified date and time into a timestamp, the syntax is "strtotime("specified date and time")"; 2. Use the date() function to format the timestamp and convert it Convert the time to "y m d" format, the syntax is "date("y m d", timestamp);".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php will change the date and time Converting to y m d format

can be converted into two steps:

• Use strtotime() to convert the specified date and time into a timestamp

• Use the date() function to format the timestamp and convert it to a time in the "y m d" format

Implementation code:

<?php
header("content-type:text/html;charset=utf-8");
$str="2022-01-18";
$timestamp=strtotime($str);
$time=date("y m d",$timestamp);
echo "y m d格式的时间：".$time;
?>

date() function formats the local date and time and returns the formatted date string.

Syntax:

date(format,timestamp);

Parameters	Description
format	Required. Specifies the format of the output date string. The following characters are available: d - day of the month (from 01 to 31) D - textual representation of the day of the week (in three letters) j - Day of the month without leading zeros (1 to 31) l (lowercase 'L') - Full textual representation of the day of the week N - ISO-8601 numeric representation of the day of the week (1 for Monday, 7 for Sunday) S ​​- English ordinal suffix for the day of the month (2 characters : st, nd, rd or th. Used with j) w - Numerical representation of the day of the week (0 represents Sunday [Sunday], 6 represents Saturday [Saturday]) z - Day of the year (from 0 to 365) W - Represents the day of the year in ISO-8601 number format (week starts with Monday) F - Full textual representation of the month (January to December) m - Numerical representation of the month (from 01 to 12) M - Month A short text representation (in three letters) of n - the numeric representation of the month without leading zeros (1 to 12) t - the number of days contained in a given month L - Whether it is a leap year (1 if it is a leap year, 0 otherwise) o - The year number under the ISO-8601 standard Y - The four-digit year Represents y - Two-digit representation of the year a - Represents lowercase: am or pm A - Represents uppercase: AM or PM B - Swatch Internet Time (000 to 999) g - 12-hour clock without leading zeros (1 to 12) G - 24-hour clock without leading zeros (0 to 23) h - 12-hour clock with leading zeros (01 to 12) H - 24-hour clock with leading zeros (00 to 23) i - Minutes, with leading zeros (00 to 59) s - Seconds, with leading zeros (00 to 59) u - Microseconds (new in PHP 5.2.2) e - Time zone identifier (e.g. UTC, GMT, Atlantic/Azores) I (uppercase i) - Whether the date is in daylight saving time (1 if it is, 0 otherwise) O - Difference in Greenwich Mean Time (GMT), in hours (Example: 0100) P - Difference in Greenwich Mean Time (GMT), Units are hours:minutes (new in PHP 5.1.3) T - abbreviation for time zone (examples: EST, MDT) Z - time zone offset in seconds . Negative time zone offsets west of UTC (-43200 to 50400) c - ISO-8601 standard dates (e.g. 2013-05-05T16:34:42 00:00) r - A date in RFC 2822 format (e.g. Fri, 12 Apr 2013 12:01:05 0200) U - The number of seconds elapsed since the Unix epoch (January 1 1970 00:00:00 GMT) Also, you can also use the following predefined constants (available starting from PHP 5.1.0): DATE_ATOM - Atom (for example: 2013-04-12T15:52:01 00:00) DATE_COOKIE - HTTP Cookies (Example: Friday, 12-Apr-13 15:52:01 UTC) DATE_ISO8601 - ISO-8601 (Example: 2013-04-12T15 :52:01 0000) DATE_RFC822 - RFC 822 (Example: Friday, 12 Apr 13 15:52:01 0000) DATE_RFC850 - RFC 850 (Example: Friday, 12-Apr- 13 15:52:01 UTC) DATE_RFC1036 - RFC 1036 (Example: Fri, 12 Apr 13 15:52:01 0000) DATE_RFC1123 - RFC 1123 (Example: Fri, 12 Apr 2013 15:52:01 0000) DATE_RFC2822 - RFC 2822 (Fri, 12 Apr 2013 15:52:01 0000) DATE_RFC3339 - Same as DATE_ATOM (as of PHP 5.1.3) DATE_RSS - RSS (Fri, 12 Aug 2013 15:52:01 0000) DATE_W3C - World Wide Web Consortium (Example: 2013-04-12T15:52:01 00:00)
timestamp	Optional. Specifies an integer Unix timestamp. The default is the current local time (time()).

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