- <?php 
-   
- CONST TIME_DIFF = 10; 
- $time = '19:01'; 
- printf("Current time: %s", $time); 
-   
-   
- $dTime = DateTime::createFromFormat('H:i', $time); 
- $minusTen = new DateInterval("PT" . TIME_DIFF . "M"); 
- $dTime->sub($minusTen); 
-   
-   
- printf("\n10 minutes before: %s", $dTime->format('H:i')); 
-   
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