The tick drifts. This is normal. Not always pleasant, especially when it gets as late as it is now - which makes operational planning rather tough for those in Europe. I'm in California, and have seen it as early as 6AM local time and earlier, to now after 2PM, and just about anything in between. It is what it is. Whenever a new patch gets applied, it will drift again. It may even skip a day to get it back to a British day time.... All happened before
With regards to CZ's not spawning on the first day of war: they will start to appear about 6-8 hours after that day's tick. You can cycle modes from that time if you don't see them in your preferred mode. Earlier than that, it's not really worth the effort. Hunt for bounties until your CZs appear.