The datetime module is missing some important methods for interacting with timestamps (i.e. seconds since 1970-01-01T00:00:00).

There are methods to convert from a timestamp, i.e. date.fromtimestamp and datetime.fromtimestamp, but there are no methods to convert back.

In addition, timedelta has no method for returning the number of seconds it represents (i.e. days*86400+seconds+microseconds/1000000).