A brief discussion on PHP timestamps and sharing several ways to obtain/format timestamps

This article takes you through PHP timestamps and briefly introduces several ways to obtain/format Unix timestamps. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

#1. Set the time zone (the default time zone is UTC)

date_default_timezone_set is used for all date and time functions in a script Default time zone;

date_default_timezone_set('Asia/Shanghai');//设置时区

The time zone of various places can be set in brackets, such as Shanghai I set above;

2. Set the current Unix timestamp

To set the current Unix timestamp, we must first know what a Unix timestamp is. The Unix timestamp starts from the Unix epoch (00:00:00 on January 1, 1970, Greenwich Mean Time) to the present The number of seconds can be set using time().

date_default_timezone_set('Asia/Shanghai');
var_dump(time());

3. Get the Unix timestamp of the specified time

We can not only get the current Unix timestamp, but also the timestamp of a custom time, by using mktime () function, you can get the timestamp of the specified time. Because what you get is the number of seconds, we can get the number of minutes by dividing by 60, and then divide by 60 to get the number of hours, and so on.

date_default_timezone_set('Asia/Shanghai');
$nowtime=time();
$future=mktime(0,0,0,10,1,2021);
echo '距离2021年国庆还有'.(($future-$nowtime)/60/60/24).'天';

4. Obtain time and date messages from Unix timestamp

After we get the current time, we can use date() to format a local time as the current time The display adds patterns and can be set according to personal preferences.

date_default_timezone_set('Asia/Shanghai');
var_dump(date('Y-m-d H:i:s'));

五、Get the number of microseconds of the Unix timestamp

You can use microtime() to get the number of microseconds of the Unix timestamp

date_default_timezone_set('Asia/Shanghai');
var_dump(microtime());
var_dump(microtime(true));

The default value is false. When displayed, seconds and microseconds are displayed separately, with microseconds in front and seconds in the back. When we use true, seconds and microseconds are displayed together.

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