Dates formatted with +00:00 to indicate UTC times are fully valid. Quote from Wikipedia: This will be printed in 2020-07-23T12:00:00+00:00. Kind! Now let`s show this to our users. Users usually don`t care about time zones, they just want to know what the date and time is for them. You may want to localize this, but for now, I`m going to use the format YYYY-MM-DD HH:MM:SS. So what will be the release of $date using this format when they are in Europe/Amsterdam? 2020-07-23 12:00:00. Hmmmz, that`s not right. I was expecting it to be 2020-07-23 14:00:00 because Amsterdam is in UTC+2:00. Procedural style only: DateTime object returned by date_create() Working on an existing code base means that you may encounter unexpected surprises, for example.
B when dates are represented as strings in the application logic. We decided to migrate this to PHP`s DateTime objects. While migrating some of these strings to DateTime instances in our codebase, I came across code where we create a DateTime object based on data from our database and API responses. The time zones of our app and website are one and the same thing, but some APIs tend to send their data in UTC. And our default time zone is Europe/Amsterdam. What can go wrong?! As a result, the date is now printed 7 days in the future. Surprise! Returns a formatted date string. If a non-numeric value is used for the timestamp, false is returned and a E_WARNING-level error is returned. Characters not recognized in the format string are printed unchanged. The z format always returns 0 when gmdate() is used. If you create DateTime objects from date-time strings and want to use them to display a readable date-time format, always specify the time zone of the object by using DateTime::setTimezone().
And to make sure you don`t end up posting incorrect times, it`s always a good idea to save or submit a timestamp, which by definition is in UTC – but can only represent dates after the Unix era or a date and time with a time zone display. The ISO 8601 date format allows UTC time in +00:00 format or with Z. This means that the following two date formats are valid: In this tutorial, you will learn more about the date and time function in PHP – it can also be set programmatically using date_default_timezone_set function. The PHP date function is a built-in function that simplifies working with date data types. The PHP date function is used to format a date or time in a human-readable format. It can be used to display the publication date of the article. Save the most recently updated data to a database. It is possible to use date() and mktime() together to find data in the future or past. UTC offsets displayed at +00:00 are perfectly valid ISO 8601 date formats. If it is absolutely necessary to use Z instead of +00:00 for UTC time, the new p format can be useful.
Here is a short list of date formats related to PHP ISO8601: With the new date formatter p, it is now possible to also create a date with the second template above: Return a new DateTime object, then format the date: DateTime::setTimezone — date_timezone_set — Sets the time zone of the DateTime object The following table shows the general parameters, used when using PHP date functions. Now let`s look at an example that uses the mktime function to create a timestamp for the 10/13/2025 date. Some examples of date formatting(). Note that you must escape all other characters, as all characters that currently have a special meaning will produce unwanted results and can be assigned to other characters in future versions of PHP. When you escape, be sure to use single quotation marks to prevent characters such as n from becoming line breaks. The time zone setting and the current time zone are ignored if the time setting contains a UNIX timestamp (e.B. 946684800) or specifies a time zone (e.B. 2010-01-28T15:00:00+02:00).
Although it is not possible to backport the trainer itself, a simple string replacement hack could get the same results as PHP 8.0 in all PHP versions since 5: This prints 2020-07-23 12:00:00; winner! But wait, this example doesn`t make sense. If you create a DateTime object without specifying a time zone, the default time zone is used. What happens if we specify a different time zone? You can use the date_default_timezone_set function to set the default time zone from a PHP script. Because this function only accepts int timestamps, the u-format character is only useful when the function is used date_format() with user-based timestamps created with date_create(). Tip: Also see the date() function, which formats a local date/time. The set time zone is then used by all dates in PHP function scripts. It has the following syntax. To generate a timestamp from a string representation of the date, you can use strtotime(). In addition, some databases have functions to convert their date formats to timestamps (e.B.
mySQLs” function UNIX_TIMESTAMP). The format of the release date string. For more information, see the formatting options below. There are also several predefined date constants that can be used instead, so that, for example, DATE_RSS contains the format string `D, d M Y H:i:s`. You can prevent a recognized character from developing in the format string by hiding it with a backslash preceded by a backslash. If the character with a backslash is already a special sequence, you may also need to escape the backslash. The mktime function returns the timestamp in Unix format. PHP 8.0 introduced a new date format: S.
This new lowercase “p” date format behaves in the same way as the uppercase P, which indicates the time zone offset. The difference between the P and p formats is that the new p format uses Z for UTC time, while the P format uses +00:00. DateTime::format — DateTimeImmutable::format — DateTimeInterface::format — date_format — Returns date formatted in a specific format To format dates in other languages, IntlDateFormatter::format() can be used instead of date(). . . .