Php datetime from microtime

PHP Date/Time Functions

The date/time functions allow you to get the date and time from the server where your PHP script runs. You can then use the date/time functions to format the date and time in several ways.

Note: These functions depend on the locale settings of your server. Remember to take daylight saving time and leap years into consideration when working with these functions.

Installation

The PHP date/time functions are part of the PHP core. No installation is required to use these functions.

Runtime Configuration

The behavior of these functions is affected by settings in php.ini:

Name	Description	Default	PHP Version
date.timezone	The default timezone (used by all date/time functions)	«»	PHP 5.1
date.default_latitude	The default latitude (used by date_sunrise() and date_sunset())	«31.7667»	PHP 5.0
date.default_longitude	The default longitude (used by date_sunrise() and date_sunset())	«35.2333»	PHP 5.0
date.sunrise_zenith	The default sunrise zenith (used by date_sunrise() and date_sunset())	«90.83»	PHP 5.0
date.sunset_zenith	The default sunset zenith (used by date_sunrise() and date_sunset())	«90.83»	PHP 5.0

PHP Date/Time Functions

Function	Description
checkdate()	Validates a Gregorian date
date_add()	Adds days, months, years, hours, minutes, and seconds to a date
date_create_from_format()	Returns a new DateTime object formatted according to a specified format
date_create()	Returns a new DateTime object
date_date_set()	Sets a new date
date_default_timezone_get()	Returns the default timezone used by all date/time functions
date_default_timezone_set()	Sets the default timezone used by all date/time functions
date_diff()	Returns the difference between two dates
date_format()	Returns a date formatted according to a specified format
date_get_last_errors()	Returns the warnings/errors found in a date string
date_interval_create_from_date_string()	Sets up a DateInterval from the relative parts of the string
date_interval_format()	Formats the interval
date_isodate_set()	Sets the ISO date
date_modify()	Modifies the timestamp
date_offset_get()	Returns the timezone offset
date_parse_from_format()	Returns an associative array with detailed info about a specified date, according to a specified format
date_parse()	Returns an associative array with detailed info about a specified date
date_sub()	Subtracts days, months, years, hours, minutes, and seconds from a date
date_sun_info()	Returns an array containing info about sunset/sunrise and twilight begin/end, for a specified day and location
date_sunrise()	Returns the sunrise time for a specified day and location
date_sunset()	Returns the sunset time for a specified day and location
date_time_set()	Sets the time
date_timestamp_get()	Returns the Unix timestamp
date_timestamp_set()	Sets the date and time based on a Unix timestamp
date_timezone_get()	Returns the time zone of the given DateTime object
date_timezone_set()	Sets the time zone for the DateTime object
date()	Formats a local date and time
getdate()	Returns date/time information of a timestamp or the current local date/time
gettimeofday()	Returns the current time
gmdate()	Formats a GMT/UTC date and time
gmmktime()	Returns the Unix timestamp for a GMT date
gmstrftime()	Formats a GMT/UTC date and time according to locale settings
idate()	Formats a local time/date as integer
localtime()	Returns the local time
microtime()	Returns the current Unix timestamp with microseconds
mktime()	Returns the Unix timestamp for a date
strftime()	Formats a local time and/or date according to locale settings
strptime()	Parses a time/date generated with strftime()
strtotime()	Parses an English textual datetime into a Unix timestamp
time()	Returns the current time as a Unix timestamp
timezone_abbreviations_list()	Returns an associative array containing dst, offset, and the timezone name
timezone_identifiers_list()	Returns an indexed array with all timezone identifiers
timezone_location_get()	Returns location information for a specified timezone
timezone_name_from_ abbr()	Returns the timezone name from abbreviation
timezone_name_get()	Returns the name of the timezone
timezone_offset_get()	Returns the timezone offset from GMT
timezone_open()	Creates new DateTimeZone object
timezone_transitions_get()	Returns all transitions for the timezone
timezone_version_get()	Returns the version of the timezonedb

PHP Predefined Date/Time Constants

Constant	Description
DATE_ATOM	Atom (example: 2019-01-18T14:13:03+00:00)
DATE_COOKIE	HTTP Cookies (example: Fri, 18 Jan 2019 14:13:03 UTC)
DATE_ISO8601	ISO-8601 (example: 2019-01-18T14:13:03+0000)
DATE_RFC822	RFC 822 (example: Fri, 18 Jan 2019 14:13:03 +0000)
DATE_RFC850	RFC 850 (example: Friday, 18-Jan-19 14:13:03 UTC)
DATE_RFC1036	RFC 1036 (example: Friday, 18-Jan-19 14:13:03 +0000)
DATE_RFC1123	RFC 1123 (example: Fri, 18 Jan 2019 14:13:03 +0000)
DATE_RFC2822	RFC 2822 (example: Fri, 18 Jan 2019 14:13:03 +0000)
DATE_RFC3339	Same as DATE_ATOM (since PHP 5.1.3)
DATE_RFC3339_EXTENDED	RFC3339 Extended format (since PHP 7.0.0) (example: 2019-01-18T16:34:01.000+00:00)
DATE_RSS	RSS (Fri, 18 Jan 2019 14:13:03 +0000)
DATE_W3C	World Wide Web Consortium (example: 2019-01-18T14:13:03+00:00)
SUNFUNCS_RET_TIMESTAMP	Timestamp (since PHP 5.1.2)
SUNFUNCS_RET_STRING	Hours:minutes (example: 09:41) (since PHP 5.1.2)
SUNFUNCS_RET_DOUBLE	Hours as a floating point number (example: 9.75) (since PHP 5.1.2)

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Функции временных меток PHP

PHP предоставляет несколько функций для выполнения операций с временными данными. В этой статье мы рассмотрим функции временных меток PHP.

Временная метка — это значение, представленное в секундах, которое рассчитывается с начала эпохи UNIX, 1 января 1970 года.

В этой статье мы рассмотрим, как с помощью PHP-функций даты и времени, связанных с временными метками:

Получение текущей временной метки в PHP

Текущее значение временной метки можно получить тремя способами.

time()

Это функция PHP для получения текущего значения временной метки. Она не принимает никаких аргументов. Пример использования:

StrToTime ()

Функция предназначена для получения метки времени из заданной строки, представляющей собой значение даты. Например, “Tuesday last week”, “+1 week”, “21 November 2008” и т. д.

Для получения текущей временной метки нужно передать функции значение “now”:

При вызове strtotime() с переданными некорректными данными, которые не поддерживаются PHP, а функция вернет значение false.

mktime()

Используется для получения метки времени UNIX. Функция принимает набор параметров, обозначающих час, минуты, секунды, месяц, день и год. А также дополнительный флаг, представляющий состояние летнего времени.

Чтобы получить текущую временную метку, в качестве параметра функции передается date() с соответствующими значениями. Например:

microtime()

Описанные выше функции PHP возвращают только десятизначное значение. Но microtime() возвращает количество секунд и микросекунд, прошедших с начала эпохи UNIX.

Функция не требует обязательных параметров. Есть необязательный параметр $get_as_float. Он принимает логические значения. Если передать TRUE, то microtime() вернет значение с плавающей запятой. Если FALSEв формате «микросекунды и секунды».

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Microseconds in PHP Date / Time Displays

The suffix .577700 is the microseconds portion of the result from microtime(). PHP date() can digest the pattern Y-m-d H:i:s.u but it expects an integer as input, so it cannot render the .u portion of the pattern as anything other than .000000

The PHP man page for date() refers us to this if we want to format microseconds.
http://php.net/manual/en/datetime.format.php

Can someone please help me connect the dots from the value of microtime(TRUE) to an output string that includes the microseconds? Thanks and regards, ~Ray

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.

GET A PERSONALIZED SOLUTION

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.

GET A PERSONALIZED SOLUTION

Thanks, Chris. Here is what I had.

 error_reporting(E_ALL); // A FUNCTION TO RETURN ISO-8601 FORMATTED DATE WITH MICROSECONDS APPENDED function date_usec($microtime=FALSE, $pat='Y-m-d H:i:s')   // http://php.net/manual/en/function.microtime.php if (!$microtime) $microtime = microtime(TRUE); $dat = date($pat, $microtime); $usc = '000000'; $str = (string)$microtime; if (strpos($str, '.')) $usc = str_pad( end(explode('.', $str)), 6, '0', STR_PAD_RIGHT); return $dat . '.' . $usc; > // SET TIME ZONE date_default_timezone_set('America/Chicago'); // MICROSECONDS IN FLOAT $now = microtime(TRUE); // TEST THE FUNCTION echo '
'; echo PHP_EOL . date_usec($now); usleep (101); echo PHP_EOL . date_usec(); usleep (101); echo PHP_EOL . date_usec( time() ); 
 
This seems like an inordinately large amount of code when the intuitive thing would be for PHP to modify the date() function to accept a float value instead of truncating it to an integer. With the decimal portion of the float, it would seem to be easy to produce the "u" portion of the pattern.
 
Also, if you want a DateTime object:
 
list($ts,$ms) = explode(".",microtime(true )); 
$dt = new DateTime(date("Y-m-d H:i:s.",$ts).$ms); 
echo $dt->format("Y-m-d H:i:s.u");
 
This is the best money I have ever spent. I cannot not tell you how many times these folks have saved my bacon. I learn so much from the contributors.
 
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microtime
 
microtime() returns the current Unix timestamp with microseconds. This function is only available on operating systems that support the gettimeofday() system call.
 
For performance measurements, using hrtime() is recommended.
 
Parameters
 
If used and set to true , microtime() will return a float instead of a string , as described in the return values section below.
 
Return Values
 
By default, microtime() returns a string in the form "msec sec", where sec is the number of seconds since the Unix epoch (0:00:00 January 1,1970 GMT), and msec measures microseconds that have elapsed since sec and is also expressed in seconds as a decimal fraction.
 
If as_float is set to true , then microtime() returns a float , which represents the current time in seconds since the Unix epoch accurate to the nearest microsecond.
 
Examples
 
Example #1 Timing script execution
 
// Sleep for a while 
usleep ( 100 );
 
$time_end = microtime ( true ); 
$time = $time_end - $time_start ;
 
echo "Did nothing in $time seconds\n" ; 
?>
 
Example #2 microtime() and REQUEST_TIME_FLOAT 
 
// Randomize sleeping time 
usleep ( mt_rand ( 100 , 10000 ));
 
 
// REQUEST_TIME_FLOAT is available in the $_SERVER superglobal array.
// It contains the timestamp of the start of the request with microsecond precision. 
$time = microtime ( true ) - $_SERVER [ "REQUEST_TIME_FLOAT" ];
 
echo "Did nothing in $time seconds\n" ; 
?>
 
See Also
 
User Contributed Notes
 
 
Date/Time Functions 
 
checkdate
 
date_​add
 
date_​create_​from_​format
 
date_​create_​immutable_​from_​format
 
date_​create_​immutable
 
date_​create
 
date_​date_​set
 
date_​default_​timezone_​get
 
date_​default_​timezone_​set
 
date_​diff
 
date_​format
 
date_​get_​last_​errors
 
date_​interval_​create_​from_​date_​string
 
date_​interval_​format
 
date_​isodate_​set
 
date_​modify
 
date_​offset_​get
 
date_​parse_​from_​format
 
date_​parse
 
date_​sub
 
date_​sun_​info
 
date_​sunrise
 
date_​sunset
 
date_​time_​set
 
date_​timestamp_​get
 
date_​timestamp_​set
 
date_​timezone_​get
 
date_​timezone_​set
 
date
 
getdate
 
gettimeofday
 
gmdate
 
gmmktime
 
gmstrftime
 
idate
 
localtime
 
microtime
 
mktime
 
strftime
 
strptime
 
strtotime
 
time
 
timezone_​abbreviations_​list
 
timezone_​identifiers_​list
 
timezone_​location_​get
 
timezone_​name_​from_​abbr
 
timezone_​name_​get
 
timezone_​offset_​get
 
timezone_​open
 
timezone_​transitions_​get
 
timezone_​version_​get
 
 
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