"22apr2018 8:36:14 # Europe/Oslo CEST"
Parsing strings with the date_parse() function:
<?php
$date 
"22apr2018 8:36:14.43 # Europe/Oslo CEST";
$t date_parse$date );

echo 
$t['year'], '-'$t['month'], '-'$t['day'], " ";
echo 
$t['hour'], ':'$t['minute'], ':'$t['second'] + $t['fraction'], " ";
echo 
$t['tz_id'], "\n";

if ( 
$t['warning_count'] )
  echo 
"Warnings:\n";
  foreach( 
$t['warnings'] as $pos => $message )
    echo 
"- $message @$pos\n";
if ( 
$t['error_count'] )
  echo 
"Errors:\n";
  foreach( 
$t['errors'] as $pos => $message )
    echo 
"- $message @$pos\n";
Output
2018-4-22 8:36:14.43 Europe/Oslo Warnings: - Double timezone specification @35 Errors: - Unexpected character @21