time in php

1$today = date("F j, Y, g:i a");   // October 30, 2019, 10:42 pm
2$today = date("D M j G:i:s T Y"); // Wed Oct 30 22:42:18 UTC 2019
3$today = date("Y-m-d H:i:s");     // 2019-10-30 22:42:18(MySQL DATETIME format)

1//place this before any script you want to calculate time
2$time_start = microtime(true); 
3
4//sample script
5for($i=0; $i<1000; $i++){
6 //do anything
7}
8
9$time_end = microtime(true);
10$execution_time = ($time_end - $time_start);
11echo '<b>Total Execution Time:</b> '.($execution_time*1000).'Milliseconds';
12

1//Get current date time in PHP
2
3// Simply:
4$date = date('Y-m-d H:i:s');
5
6// Or:
7$date = date('Y/m/d H:i:s');
8
9// This would return the date in the following formats respectively:
10$date = '2012-03-06 17:33:07';
11// Or
12$date = '2012/03/06 17:33:07';
13
14/** 
15 * This time is based on the default server time zone.
16 * If you want the date in a different time zone,
17 * say if you come from Nairobi, Kenya like I do, you can set
18 * the time zone to Nairobi as shown below.
19 */
20
21date_default_timezone_set('Africa/Nairobi');
22
23// Then call the date functions
24$date = date('Y-m-d H:i:s');
25// Or
26$date = date('Y/m/d H:i:s');
27
28// date_default_timezone_set() function is however
29// supported by PHP version 5.1.0 or above.
30

1// for a human time string like: "It's around ten past twelve" 
2// usage: echo 'It\'s ' . humanTime(date('h'), date('i'));
3
4function humanTime($hour, $min) {
5    $times = [
6        0 => '%s o\'clock',
7        2 => 'a couple of mins past %s',
8        5 => 'five past %s',
9        8 => 'around ten past %s',
10        10 => 'ten past %s',
11        15 => 'quarter past %s',
12        20 => 'twenty past %s',
13        25 => 'twenty five past %s',
14        27 => 'around half past %s',
15        30 => 'half past %s',
16        33 => 'around thirty five past %s',
17        35 => 'thirty five past %s',
18        40 => 'twenty to %s',
19        43 => 'around quarter to %s',
20        45 => 'quarter to %s',
21        47 => 'about ten to %s',
22        50 => 'ten to %s',
23        53 => 'about five to %s',
24        55 => 'five to %s'
25    ];
26    
27    $hourWord = [
28        'one',
29        'two',
30        'three',
31        'four',
32        'five',
33        'six',
34        'seven',
35        'eight',
36        'nine',
37        'ten',
38        'eleven',
39        'twelve'
40    ];
41
42    $hour = (int) $hour;
43    $min = (int) $min;
44    
45    $closest = null;
46    foreach ($times as $key => $item) 
47        if ($closest === null || abs($min - $closest) > abs($key - $min)) $closest = $key;
48    
49    if ($hour === 0) $hour = 12;
50    
51    if ($min > 40) $hour = $hour === 12 ? 1 : $hour + 1;
52
53    return sprintf($times[$closest], $hourWord[(int) $hour - 1]);
54}

1<?php 
2/* Unix Timestamp */
3$timestamp = time();
4echo $timestamp . "<br>";
5echo date("d/m/Y", $timestamp);
6?>

1echo date('d/m/Y h:i:s a');	// 01/02/2020 01:01:30 am
2// d - The day of the month (from 01 to 31)
3// D - A textual representation of a day (three letters)
4// j - The day of the month without leading zeros (1 to 31)
5// l (lowercase 'L') - A full textual representation of a day
6// N - The ISO-8601 numeric representation of a day (1 for Monday, 7 for Sunday)
7// S - The English ordinal suffix for the day of the month (2 characters st, nd, rd or th. Works well with j)
8// w - A numeric representation of the day (0 for Sunday, 6 for Saturday)
9// z - The day of the year (from 0 through 365)
10// W - The ISO-8601 week number of year (weeks starting on Monday)
11// F - A full textual representation of a month (January through December)
12// m - A numeric representation of a month (from 01 to 12)
13// M - A short textual representation of a month (three letters)
14// n - A numeric representation of a month, without leading zeros (1 to 12)
15// t - The number of days in the given month
16// L - Whether it's a leap year (1 if it is a leap year, 0 otherwise)
17// o - The ISO-8601 year number
18// Y - A four digit representation of a year
19// y - A two digit representation of a year
20// a - Lowercase am or pm
21// A - Uppercase AM or PM
22// B - Swatch Internet time (000 to 999)
23// g - 12-hour format of an hour (1 to 12)
24// G - 24-hour format of an hour (0 to 23)
25// h - 12-hour format of an hour (01 to 12)
26// H - 24-hour format of an hour (00 to 23)
27// i - Minutes with leading zeros (00 to 59)
28// s - Seconds, with leading zeros (00 to 59)
29// u - Microseconds (added in PHP 5.2.2)
30// e - The timezone identifier (Examples: UTC, GMT, Atlantic/Azores)
31// I (capital i) - Whether the date is in daylights savings time (1 if Daylight Savings Time, 0 otherwise)
32// O - Difference to Greenwich time (GMT) in hours (Example: +0100)
33// P - Difference to Greenwich time (GMT) in hours:minutes (added in PHP 5.1.3)
34// T - Timezone abbreviations (Examples: EST, MDT)
35// Z - Timezone offset in seconds. The offset for timezones west of UTC is negative (-43200 to 50400)
36// c - The ISO-8601 date (e.g. 2013-05-05T16:34:42+00:00)
37// r - The RFC 2822 formatted date (e.g. Fri, 12 Apr 2013 12:01:05 +0200)
38// U - The seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)