Agreed- end of day is different depending on where you're located and WGT is on the west coast in the US. The rules (for those who bothered to read them) clearly state what time the qualifying ends, and as others have posted, it always ends on the Sunday of the event (U.S. Open, British, etc). One player in particular lashed out at WGT because he had planned to spend all day Monday trying to qualify, only to find that the door was closed. We did have a month to try to make it in.
I shot a 58 one of the first times I played the course (got lucky with a 27 on the back), and never improved once the cut went to 57. On Sunday (THE last day to qualify), I needed to birdie 18 for 57, but missed. Fun event that the WGT runs for these 'majors'. Now what do I do ;)