How many days before my arrival do I need to apply for the Thailand Pass and where can I find the official link?

I recommend doing that sooner than later. Some people get approved in hours, other people it had taken weeks. I was approved in 3 weeks.

I recommend you ask for a hotel recommendation within this group. A hotel people have had good experiences with. I think part of the slow turn around with the Thail Pass is that hotel didn't know what they are doing.

Thailand Pass

Thailand Pass FAQs

I also arrive on April 1st. I requested my thai pass last week and got the approval 5 days later. I suggest you hurry up and request it as soon as you book your hotel and insurance.

Be careful of a scam email that come after you do the thaipass

april fools day huh? whew i dunno if i would be that brave

Soon the better. There are issues will applying and then the registration gets lost, then a week later the registration gets found so you will want to be patient waiting for approval. Avoid re-applying when the status is "registration not found".

I would recommend using a hotel that comes recommended, that someone said they had a positive experience. The hotel I used sucked. Maybe not their fault, we'll never know but I wouldn't do it again.

Apply now is ok.

I believe the limit is 60 days so you’re well within that. Apply now.