Raids tied to daytime cycle

I have noticed the opposite...but I am in the southern hemisphere.

The raids are finishing earlier and earlier and the days are getting longer and longer.
If this keeps up, in a couple of weeks when we hit daylight savings, we are going to have about 2-3 hours of daylight without any raids at all.

EDIT Then again, Niantic have not been good with timezones - here our daily spin/first catch of the day, and gym rewards reset at 12:30am, and not at midnight because Niantic appear to think that South Australia has the same timezone as Victoria and New South Wales.

Can you imagine the outcry if, for the first 12 months+ of the games existence they completely disregarded an entire time zone in America, leaving some regions using a timezone from thousands of km's away?

When we did a Tyranitar raid today, the game had turned to nighttime. There was about 15 minutes left on the timer.

I am located at the equator so not much changes lol

You're right, they end about 8:30 now (EDT) and it's getting earlier every day. They're not even compensating by having more raids earlier.... there were none between 5:30 and 7:30 in 8 gyms I observed. I could barely get one raid done (t2 - got only potions/revives)....

Days are getting shorter, but raids still happens until same times.
Yesterday I did a raid at 9pm, it was dark already...

We have rather extreme differences up here. Two months of midnight sun in June/July. Now about 12h each of day and night, and two month without sun in December/January.

But we have seen very small differences so far (Egg start around 6AM and last raid finish between 8-9 PM. So it is certainly not tied to the daylight cycle in the game!