Take a look at this next to yesterday's blog. Don't get them confused.
When a noun clause is the subject of the sentence, do not separate it from the verb with punctuation.
...Whether he is attending is not my concern.
...Whether he is attending the conference on the effects of caffeine on children that is to
take place later this month at the hotel by the airport NO COMMA is not my concern.
...When he will join us at the firm is anybody's guess.
...When he will join us at the firm to act as a liaison to the international bank that we are
using for the monetary transactions that are involved in this deal NO COMMA is
anybody's guess.
Happy punctuating!
Margie