Finding a streek

Hi,

I'm trying to find out how to return the date or time of a streak occurring in a coin toss.
The streak I'm trying to identify is when a Heads follows a Tails (T following H) more than 4 times in a row:

For example: t t t t h t h t h t h t h t t h h h t h t h

Where the streak is bold.

I have an example sheet attached with the date in column A and the coin flip in B and a 1 & 0 column in C (I was trying to use the 1's and 0's b/c I thought they'd be easier to work with than strings.

Also, there might be some days that no coin is tossed, these days should be skipped.
I'd like to find out when the date of a streak occurs.

Can anyone help with this?

Thanks in advance.