How to add one day timestamp in php

Two ways to add: 1. Directly use the strtotime() function to calculate the time interval, and the date after the interval can be returned in UNIX timestamp format, with the syntax "strtotime(" 1 day")"; 2. Use the time() function to calculate the current timestamp, and add the number of seconds in a day to the current timestamp. The syntax is "time() (1 * 24 * 3600)".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

There are two ways to add a one-day timestamp to php Method:

• Directly use the strtotime() function

• Use time() to calculate the number of seconds in a day

Method 1: Use strtotime() function

Sometimes we need to add or subtract a certain time interval to a date. You can use strtotime() to calculate some date time intervals and return the interval dates in UNIX timestamp format.

strtotime() function has two uses: one is to parse the date and time in the form of a string and described in English text into a UNIX timestamp, and the other is to calculate some date and time interval.

Example:

<?php
header("Content-type:text/html;charset=utf-8");
echo "当前时间戳为：".strtotime("now")."<br>";
echo "格式化后：".date("Y-m-d H:i:s",strtotime("now"))."<br><br>";
echo "增加一天的时间戳为：".strtotime("+1 day")."<br>";
echo "格式化后：".date("Y-m-d H:i:s",strtotime("+1 day"));
?>

Method 2: Use time() to calculate the number of seconds in a day

The time() function returns the current time in seconds since the Unix epoch (January 1 1970 00:00:00 GMT).

time() Use the interval seconds to get the timestamp several days after the current timestamp. Because this article seeks the timestamp one day later, the interval seconds can be the number of seconds in a day.

Calculation method of seconds in a day: 1 * 24 * 3600

Example:

<?php
header("Content-type:text/html;charset=utf-8");
echo "当前时间戳为：".time()."<br>";
echo "格式化当后：".date("Y-m-d H:i:s",time())."<br><br>";
$interval = 1 * 24 * 3600;
echo "增加一天的时间戳为：".(time()+$interval)."<br>";
echo "格式化当后：".date("Y-m-d H:i:s",time()+$interval)."<br>";
?>

Extended knowledge: date() function

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

Syntax

date(format,timestamp);

Returns the string generated by converting the integer timestamp according to the given format string. If no timestamp is given, the local current time is used. In other words, timestamp is optional and the default value is time().

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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