holidays - observed vs actual date

hi there!

is there any info on how prophet handles observed vs actual holiday dates? (ex: 4th july 2020 is observed on 3rd july)

docs seem to mention observed dates but I was seeing effects on the other ones.

thanks!

https://support.predicthq.com/what-is-the-difference-between-an-observed-holiday-and-an-observance
"For example, if July 4th (Independence Day) falls on a Saturday, it is "observed" on the Friday before as a holiday (and is usually a day off work). When a federal holiday falls on a weekend, the holiday is usually observed the Friday before or the Monday after. Below is a list of the federal holidays:"