Sorry...
The section of the Federal Aviation Regulations that addresses the logging of flight time is Part 61....not 91, or 135, or 121.
Sorry.....
Now, would an airline, during an interview, accept this from an applicant? Probably not, in fact, I'd bet not.
However, under the law, is it legal?...you bet it is!!!!
PantLoad
p.s. a call to the legal department of AOPA can clear up any doubt.