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<?php $a = date("Y-m-d H:i:s") - 100; echo $a;
based on dRR3H
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/05g6J
function name:  (null)
number of ops:  7
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'date'
         1        SEND_VAL                                                 'Y-m-d+H%3Ai%3As'
         2        DO_ICALL                                         $1      
         3        SUB                                              ~2      $1, 100
         4        ASSIGN                                                   !0, ~2
   3     5        ECHO                                                     !0
         6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0