PHP
Date and Time
Dates are so much part of everyday life that it
becomes easy to work with them without thinking. PHP also provides powerful
tools for date arithmetic that make manipulating dates easy.
Getting the
Time Stamp with time()
PHP's time() function gives you
all the information that you need about the current date and time. It requires
no arguments but returns an integer.
The integer returned by time() represents the
number of seconds elapsed since midnight GMT on January 1, 1970. This moment is
known as the UNIX epoch, and the number of seconds that have elapsed since then
is referred to as a time stamp.
<?php
print time();
?>
This will produce the following result –
1459194178
This is something difficult to understand. But PHP
offers excellent tools to convert a time stamp into a form that humans are
comfortable with.
Converting a
Time Stamp with getdate()
The function getdate() optionally
accepts a time stamp and returns an associative array containing information
about the date. If you omit the time stamp, it works with the current time
stamp as returned by time().
Following table lists the elements contained in the
array returned by getdate().
Sr.No |
Key & Description |
Example |
1 |
seconds Seconds past the minutes (0-59) |
20 |
2 |
minutes Minutes past the hour (0 - 59) |
29 |
3 |
hours Hours of the day (0 - 23) |
22 |
4 |
mday Day of the month (1 - 31) |
11 |
5 |
wday Day of the week (0 - 6) |
4 |
6 |
mon Month of the year (1 - 12) |
7 |
7 |
year Year (4 digits) |
1997 |
8 |
yday Day of year ( 0 - 365 ) |
19 |
9 |
weekday Day of the week |
Thursday |
10 |
month Month of the year |
January |
11 |
0 Timestamp |
948370048 |
Now you have complete control over date and time.
You can format this date and time in whatever format you wan.
Example
Try out following example
<?php
$date_array =
getdate();
foreach ( $date_array as $key => $val ){
print "$key = $val<br />";
}
$formated_date = "Today's
date: ";
$formated_date .=
$date_array[mday] . "/";
$formated_date .=
$date_array[mon] . "/";
$formated_date .= $date_array[year];
print
$formated_date;
?>
This will produce following result –
seconds
= 58
minutes = 42
hours = 19
mday = 28
wday = 1
mon = 3
year = 2016
yday = 87
weekday = Monday
month = March
0 = 1459194178
Today's date: 28/3/2016
Converting a Time
Stamp with date()
The date() function returns a
formatted string representing a date. You can exercise an enormous amount of
control over the format that date() returns with a string argument that you
must pass to it.
date(format,timestamp)
The date() optionally accepts a time stamp if
omitted then current date and time will be used. Any other data you include in
the format string passed to date() will be included in the return value.
Following table lists the codes that a format
string can contain −
Sr.No |
Format & Description |
Example |
1 |
a 'am' or 'pm' lowercase |
pm |
2 |
A 'AM' or 'PM' uppercase |
PM |
3 |
d Day of month, a number with leading zeroes |
20 |
4 |
D Day of week (three letters) |
Thu |
5 |
F Month name |
January |
6 |
h Hour (12-hour format - leading zeroes) |
12 |
7 |
H Hour (24-hour format - leading zeroes) |
22 |
8 |
g Hour (12-hour format - no leading zeroes) |
12 |
9 |
G Hour (24-hour format - no leading zeroes) |
22 |
10 |
i Minutes ( 0 - 59 ) |
23 |
11 |
j Day of the month (no leading zeroes |
20 |
12 |
l (Lower 'L') Day of the week |
Thursday |
13 |
L Leap year ('1' for yes, '0' for no) |
1 |
14 |
m Month of year (number - leading zeroes) |
1 |
15 |
M Month of year (three letters) |
Jan |
16 |
r The RFC 2822 formatted date |
Thu, 21 Dec 2000 16:01:07 +0200 |
17 |
n Month of year (number - no leading zeroes) |
2 |
18 |
s Seconds of hour |
20 |
19 |
U Time stamp |
948372444 |
20 |
y Year (two digits) |
06 |
21 |
Y Year (four digits) |
2006 |
22 |
z Day of year (0 - 365) |
206 |
23 |
Z Offset in seconds from GMT |
+5 |
Example
Try out following example
<?php
print date("m/d/y G.i:s<br>", time());
print "Today is ";
print date("j of F Y, \a\\t g.i a", time());
?>
This will produce following result –
03/28/16
19.42:58
Hope you have good understanding on how to
format date and time according to your requirement. For your reference a
complete list of all the date and time functions is given in PHP Date
& Time Functions.