1--TEST-- 2Bug #50555 (DateTime::sub() allows 'relative' time modifications) (OO). 3--FILE-- 4<?php 5$now = '2010-03-07 13:21:38 UTC'; 6//positive DateInterval 7$da1 = date_create( $now ); 8$ds1 = date_create( $now ); 9$i = DateInterval::createFromDateString('third Tuesday of next month'); 10echo $da1->format( DateTime::ISO8601 ), "\n"; 11echo date_add($da1, $i)->format( DateTime::ISO8601 ), "\n"; 12try { 13 $ds1->sub($i); 14} catch (DateInvalidOperationException $e) { 15 echo $e::class, ': ', $e->getMessage(), "\n"; 16} 17 18//negative DateInterval 19$da2 = date_create( $now ); 20$ds2 = date_create( $now ); 21$i2 = DateInterval::createFromDateString('third Tuesday of last month'); 22echo $da2->format( DateTime::ISO8601 ), "\n"; 23echo date_add($da2, $i2)->format( DateTime::ISO8601 ), "\n";//works 24try { 25 $ds2->sub($i); 26} catch (DateInvalidOperationException $e) { 27 echo $e::class, ': ', $e->getMessage(), "\n"; 28} 29?> 30--EXPECTF-- 312010-03-07T13:21:38+0000 322010-04-20T13:21:38+0000 33DateInvalidOperationException: DateTime::sub(): Only non-special relative time specifications are supported for subtraction 342010-03-07T13:21:38+0000 352010-02-16T13:21:38+0000 36DateInvalidOperationException: DateTime::sub(): Only non-special relative time specifications are supported for subtraction 37
