The ANNUAL intervals for full screen stock charts aren't working properly.
While they cover 1 year, the time frames vary with the stock being trended. I would expect that if I select a 1 YEAR interval for any stock trend, each point would represent the year end closing price (or the current or last closing price for the current year). Instead that 1 year period varies with the stock selected. I first noticed this with ^GSPC when the 1 year intervals showed the opening values on December 1st and a closing value for November 31st. So I checked several other tickers by selecting the full screen stock chart, then selecting the 1 Month chart and then changing the chart interval to 1 year and looking at the opening and closing values shown on the “Heads Up Display”. This is what I found:
^DJI & FCNTX 1/1 – 12/31
(Which is the way I would expect all of the trends to work)
^GSPC & AAPL 12/1 – 11/30
NI 2/1 – 1/31
BRK-B 5/1 – 4/30
GOOG 8/1 – 7/31