PHP solves the problem of Unix timestamp and date transfer based on DateTime class [for timestamps before 1970 and after 2038]

In this paper, an example is given to explain how PHP solves the problem of Unix timestamp and date conversion based on DateTime class. Share it for your reference, as follows:

This problem mainly occurs in 32-bit systems, but does not exist in 64-bit systems. php 5.2 + provides the DateTime class to handle such problems, with the following reference scenario (note the handling of time zones):

//1 , Unix Time stamp to date 
function unixtime_to_date($unixtime, $timezone = 'PRC') {
  $datetime = new DateTime("@$unixtime"); //DateTime Class bug , join @ You can set the Unix The timestamp is passed in as a parameter 
  $datetime->setTimezone(new DateTimeZone($timezone));
  return $datetime->format("Y-m-d H:i:s");
}
//2 , date transfer Unix Time stamp 
function date_to_unixtime($date, $timezone = 'PRC') {
  $datetime= new DateTime($date, new DateTimeZone($timezone));
  return $datetime->format('U');
}
echo date_to_unixtime("1900-1-31 00:00:00"); // Output -2206425952
echo '<br>';
echo unixtime_to_date(date_to_unixtime("1900-1-31 00:00:00")); // Output 1900-01-31 00:00:00

PS: Here are some time and date related tools for your reference:

Online date/day calculator:
http://tools.ofstack.com/jisuanqi/date_jisuanqi

Online date calculator/difference days calculator:
http://tools.ofstack.com/jisuanqi/datecalc

Online Date-Day Difference Calculator:
http://tools.ofstack.com/jisuanqi/onlinedatejsq

Unix timestamp (timestamp) conversion tool:
http://tools.ofstack.com/code/unixtime

For more readers interested in PHP related content, please check the topics on this site: "Summary of php Date and Time Usage", "Encyclopedia of PHP Array (Array) Operation Skills", "Introduction to php Object-Oriented Programming", "Summary of php String (string) Usage", "Introduction to php+mysql Database Operation" and "Summary of php Common Database Operation Skills"

I hope this article is helpful to everyone's PHP programming.