What is the time zone Yahoo Finance uses for crypto close prices?

I am using the yfinance (Yahoo Finance API) library to retrieve crypto prices (e.g. ETH-USD). I am trying to figure out when the next line (i.e. current day or previous day) will be available. In other words: the close time of the previous day is which time in which timezone?

When I examine the ticker graph I can’t seem to figure it out. For instance: today ETH-USD’s last ‘close’ price is listed at 651.814. For some reason my current time on the graph is in UK time zone (although I am in Singapore).

I cannot find the 651.814 time on the graph. As which time/tz is the close price taken?

It’s not 12am UK time:

Also not 5am UK time = midnight NY time:

From Yahoo help I can only find information about stock exchanges.

I only found this question related to stock markets, but obviously for crypto it’s different as trading is continuous.

##Update, some more info

A few hours before 9pm Eastern time, the day goes blank and the next day already shows up. This is 20 Dec 9PM EST:

Then after 9pm EST, the row fills in and tomorrows disappears:

The close time is given as 638.29, which is the price roughly around 7pm EST:

So far, it seems like the data is 2 hours delayed with day ending at 9pm EST. In this case. If there is such a huge delay I may need to find a different API. Also strange that there is a big difference between close and next day open prices. Especially if the market is continuous?