How PHP avoids 1970 time stamp failure

How PHP handles 1970 before time stamp is invalidated.
Recently involved in the processing of ancient dates, time stamp can not be used AH date mktime less than 1970 will not be

For example, 1885-11-25 and 1901-01-12 dates are bad.

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PHP Code

Mysql_connect (); $d 1 = ' 1901-01-12 '; $d 2 = ' 1885-11-25 '; $rs = mysql_query ("Select To_days (' $d 1 ')-to_days (' $d 2 ')"); List ( $t) = Mysql_fetch_row ($rs); Echo $t;
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   PHP Code
   
   
   
Date_default_timezone_set (' Asia/hong_kong '); $datetime 1 = new datetime (' 1885-11-25 '); $datetime 2 = new DateTime (' 1901-01-12 '); $interval = $datetime 1->diff ($datetime 2);p Rint_r ($interval);
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