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Timestamp

time() returns the current Unix timestamp, which is the number of seconds since 1 Jan 1970 Midnight GMT. microtime($b) returns the current Unix timestamp with microseconds. If $b is true, a float instead of a string is returned. gettimeofday($b) returns the current Unix timestamp. If $b is true, a float instead of an array is returned. mktime([$i1[, $i2[, $i3[, $i4[, $i5[, $i6]]]]]]) returns a Unix timestamp for the date and time. The parameters are respectively the hour, minute, second, month, day and year. gmmktime(……) is similar to mktime(……) except that the passed parameters represent a GMT date.

timestamp.php:
<!DOCTYPE html><html><head></head>
<body><?php

echo time()."<br />";
echo microtime()."<br />";
echo microtime(true)."<br />";
echo gettimeofday(true)."<br />";
print_r(gettimeofday()); echo "<br /><br />";

echo mktime(23,59,59,12,30,2012)."<br />";
echo gmmktime(23,59,59,12,30,2012)."<br />";

?></body></html>

1353229775
0.16088300 1353229775
1353229775.1609
1353229775.1609
Array ( [sec] => 1353229775 [usec] => 160895 [minuteswest] => -60 [dsttime] => 0 )

1356908399
1356911999
For the following functions in this paragraph, $ts refers to the timestamp integer. If omitted, it means the current timestamp. date($format[,$ts]) returns a string representing the datetime in the specified format.  gmdate($format[,$ts]) is identical to date() except that the time returned is GMT. idate($format[,$ts]) returns an integer according to the given format string which is a single character. getdate([$ts]) returns an associative array containing the datetime information. localtime([$ts[,$b=false]]) returns an array containing information about the local time. If $b is true, an associative array will be returned. strtotime($s[,$ts]) returns a timestamp integer from the textual datetime specified by $s. $ts here signifies the relative timestamp. 

<!DOCTYPE html><html><head></head>
<body><?php

echo date('d-M-Y h:i:sa')."<br />";
echo gmdate('d-M-Y h:i:sa')."<br />";
echo idate('Y')."<br />";
print_r(getdate()); echo "<br />";
print_r(localtime()); echo "<br />";
print_r(localtime(time(),true)); echo "<br />";

echo strtotime('30-12-2012')."<br />";
echo strtotime('now')."<br />";
echo strtotime('yesterday')."<br />";
echo strtotime('+1 day')."<br />";
echo strtotime('+1 week')."<br />";
echo strtotime('+1 week 2 days 4 hours 2 seconds')."<br />";
echo strtotime('next Thursday')."<br />";
echo strtotime('last Monday')."<br />";
echo strtotime('2000-12-25 18:30:30')."<br />";
echo strtotime('2000:12:25 18:30:30')."<br />";

?></body></html>

18-Nov-2012 11:10:39am
18-Nov-2012 10:10:39am
2012
Array ( [seconds] => 39 [minutes] => 10 [hours] => 11 [mday] => 18 [wday] => 0 [mon] => 11 [year] => 2012 [yday] => 322 [weekday] => Sunday [month] => November [0] => 1353233439 )
Array ( [0] => 39 [1] => 10 [2] => 11 [3] => 18 [4] => 10 [5] => 112 [6] => 0 [7] => 322 [8] => 0 )
Array ( [tm_sec] => 39 [tm_min] => 10 [tm_hour] => 11 [tm_mday] => 18 [tm_mon] => 10 [tm_year] => 112 [tm_wday] => 0 [tm_yday] => 322 [tm_isdst] => 0 )

1356822000
1353233439
1353106800
1353319839
1353838239
1354025441
1353538800
1352674800
977765430
977765430