Add PHP 8.4 support

[Baptouuuu]

While running blackbox for the PHP 8.4 support it found a bug where mktime produced errors since the values below 101 for the year represent the dates between 1970 and 2069.

Hence the big diff on Day and Month.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.80%. Comparing base (30b5067) to head (503d0e5).
Report is 8 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #16      +/-   ##
=============================================
- Coverage      99.91%   99.80%   -0.12%     
- Complexity       706      748      +42     
=============================================
  Files             56       56              
  Lines           2495     2530      +35     
=============================================
+ Hits            2493     2525      +32     
- Misses             2        5       +3     

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