Answer
Wednesday
Work Step by Step
The formula for the day of the week in $N$ days is $DayN = ((DayT)+N)\ mod\ 7$, where $DayN$ is the day of the week in $N$ days, $DayT$ is the day of the week today, and the days Sunday through Saturday are numbered $0$ through $6$, respectively. Therefore, if $DayT=1$ and $N=30$, we have $DayN = (1+30)\ mod\ 7=31\ mod\ 7=3$, because $31=7(4)+3$. See example 4.4.3 for an explanation of the formula $DayN = ((DayT)+N)\ mod\ 7$.
