Timer, timezone, server side time, client side countdown

问题

I've launch a project recently (here), and I'm stuck with a timer/time question :

I have a cronjob who runs everyday, twice a day : midnight and midday in french timezone.

I want to display a "countdown till next page", which is in fact a countdown till cronjob.

I'm a bit stuck, because when I start to think time and timezone related things, my brain just freeze.

I know I should take server side time, and display my variables in a client side timer (without getting the client side time), but that's pretty much it.

I'd really appreciate some advises !

Thanks in advance to all of you !

回答1:

You can use php DateTime for this.

• The current time
• The midday time
• The midnight time

Here is an example.

$now = new DateTime;
$morning = new DateTime('08:00');
$night = new DateTime('22:00');
// next time is night
if( $now > $morning && $now < $night )
{
    $time = $now->diff($night);
} 
// next time is day
else 
{
    $time = $now->diff($morning);

}

$target = $time->format('%h:%i:%s'); // returns a string.

回答2:

You should use Keith Wood's countdown timer: http://keith-wood.name/countdown.html

It is extremely easy to use.

All you have to do is

$('#timer').countdown({
    until: '<?php echo date("h:i:s"); ?>' // change this, obviously
});

Here's the fiddle: http://jsfiddle.net/tqyj4/289/

来源：https://stackoverflow.com/questions/17733345/timer-timezone-server-side-time-client-side-countdown