PHP printing techniques at any time_PHP tutorial

What I want to introduce to you today is about

PHP printing arbitrary time code:

1. < ?php
2. date_default_timezone_set
   ('Asia/Shanghai');
3. $a = date ('Y-m-d H:i:s',
   strtotime('-1 day'));
4. echo $a;
5. ?>

The above PHP print any time code can print the day before Time, use a similar method to print any specific time you require. Among them - is the corresponding time in the past, and + is the corresponding time in the future.

1. -1 year
2. -1 month
3. -1 day
4. -1 hour
5. -1 minute
6. -1 second

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