I've got a timestamp in the following format (Which can easily be changed thanks to the beauties of PHP!).
2011-02-12 14:44:00
What is the quickest/simplest way to check if this timestamp was taken today?
- 1do you mean "on this day" or within the last 24 hours?Mark Elliot– Mark Elliot2011-04-25 04:11:17 +00:00Commented Apr 25, 2011 at 4:11
- 3@Mark This might help en.wiktionary.org/wiki/today ;)Rudie– Rudie2011-04-25 04:28:21 +00:00Commented Apr 25, 2011 at 4:28
- 6definition of today: "this day"Web_Designer– Web_Designer2011-04-25 04:53:21 +00:00Commented Apr 25, 2011 at 4:53
- @Mark so when someone expects you to go to the shop today, they might have a surprise...bokkie– bokkie2022-07-05 15:48:06 +00:00Commented Jul 5, 2022 at 15:48
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7 Answers
I think:
date('Ymd') == date('Ymd', strtotime($timestamp)) 11 Comments
DJafari
i think check equal between 2 integer is better than 2 string
deceze
@Davood I'd be curious to know why.
DJafari
1. if case sensitive of 2 string be diffrent, return false, 2. for php optimization check equal between 2 integer is more optimal between 2 string . this is my idea .
Rudie
Technically, they're both strings. They will be evaluated as two integers though (PHP is crazy). In thise case that doesn't matter, because both sides are 8 characters (digits) long and none start with 0. If either were false, you'd have to use
===.deceze
@Davood You're explicitly creating two strings of the format
Y-m-d there, no case sensitivity problems possible. Maybe two integers are faster to compare, but you'll have to convert both into an integer before you can compare them, which is more overhead than comparing two strings directly. |
if (date('Y-m-d') == date('Y-m-d', strtotime('2011-02-12 14:44:00'))) { // is today } 
Comments
$offset = date('Z'); //timezone offset in seconds if (floor(($UNIX_TIMESTAMP + $offset) / 86400) == floor((mktime(0,0,0) + $offset) / 86400)){ echo "today"; } 
Comments
This is what i use for this kind of task :
/** date comparator restricted by $format. @param {int/string/Datetime} $timeA @param {int/string/Datetime} $timeB @param {string} $format @returns : 0 if same. 1 if $timeA before $timeB. -1 if after */ function compareDates($timeA,$timeB,$format){ $dateA=$timeA instanceof Datetime?$timeA:(is_numeric($timeA)?(new \Datetime())->setTimestamp($timeA):(new \Datetime("".$timeA))); $dateB=$timeB instanceof Datetime?$timeB:(is_numeric($timeB)?(new \Datetime())->setTimestamp($timeB):(new \Datetime("".$timeB))); return $dateA->format($format)==$dateB->format($format)?0:($dateA->getTimestamp()<$dateB->getTimestamp()?1:-1); } compare day : $format='Y-m-d'.
compare month : $format='Y-m'.
etc...
in your case :
if(compareDates("now",'2011-02-12 14:44:00','Y-m-d')===0){ // do stuff } 
Comments
I prefer to compare timestamps (rather then date strings), so I use this to check today.
$dayString = "2011-02-12 14:44:00"; $dayStringSub = substr($dayString, 0, 10); $isToday = ( strtotime('now') >= strtotime($dayStringSub . " 00:00") && strtotime('now') < strtotime($dayStringSub . " 23:59") ); Fiddle: http://ideone.com/55JBku
1 Comment
Machavity
Some explanation about your answer would be helpful
(date('Ymd') == gmdate('Ymd', $db['time']) ? 'today' : '') Comments
are you mean this ?
if( strtotime( date( 'Y-m-d' , strtotime( '2011-02-12 14:44:00' ) ) ) == strtotime( date( 'Y-m-d' ) ) ) { //IS TODAY; } 
3 Comments
DJafari
why ? i think it's more better !
Rudie
It's more better..? Sure... but it's still a waste of date calculations. Without the 2
strtotime's, you know enough to make the evaluation.deceze
Furthermore, this may result in incorrect values. UNIX timestamps are seconds and
strtotime fills in any information that's not in the given date string from the current time. I.e. the hours, minutes and seconds part of strtotime('2011-02-12') will be taken from the current time. In the rare circumstance that the time advances by one second between the first call to strtotime and the second, you may get two different timestamps for the same day.