having trouble understanding this: GetYYYYMMDD() != GetYYYYMMDD()[1]

[dans]

I am having trouble understanding this:
def rollover = GetYYYYMMDD() != GetYYYYMMDD()[1].
reference: https://usethinkscript.com/threads/relative-vol-for-firstbarofday.8359/

I guess, GetYYYYMMDD() and GetYYYYMMDD()[1] are two different elements in an array like structure. Why bother checking that? When will they equal to each other?

Please kindly help! Thank you!

 

[Joshua]

It's the date of the current bar, relative to the date of the prior bar. If they are different, it means a new day has started. On an intraday basis, they will remain equal to each other throughout the day on each bar after the initial rollover.

 

[dans]

It's the date of the current bar, relative to the date of the prior bar. If they are different, it means a new day has started. On an intraday basis, they will remain equal to each other throughout the day on each bar after the initial rollover.

Thank you so much Joshua!!! That bothered me for quite a while. Your explanation is very clear!!! I saw similar things, like XXX() != XXX()[1], quite often.