You need seconds. Also make sure your system clock is accurate and that you're in Weebly's time zone.
- Divided by 1000.
- Changed the clock to Pacific time
- rounded using either parseInt, Math.round and Mouth.ceil
You only have to be close by 60 seconds give or take, so just hard code in the timestamp: http://www.unixtimestamp.com/
It's a pain in the ass to change every minute, but it works and you'll get on with the rest of it.
I changed the timezone in my computer, calculated time differences. Everything. What is getting on me is precisely the fact that this is supposed to be so trivial.