Why does millis() not work on ATTINY85

Projects Programming
19

Good question. I used this link: inhoud - Bootloader installeren op de ATTiny85 - Opencircuit. I don't see any settings there. The example below is resulting in a zero so millis() is not working. I don't burn before uploading. It's not possible also because my programmer USB is only avail after compile for short time.

             beginTime = millis();
             delay(1800);
             endTime = millis();

             if ( endTime - beginTime == 0) { Level[Order[0]] = 63;}
             if ( endTime - beginTime > 0) { Level[Order[1]] = 63; }
             if ( endTime - beginTime > 100) { Level[Order[2]] = 63; }
             if ( endTime - beginTime > 1000) { Level[Order[3]] = 63; }
             if ( endTime - beginTime > 1500) { Level[Order[4]] = 63; }
             if ( endTime - beginTime > 2000) { Level[Order[5]] = 63; }