What does line 78 do?
The else statement cannot have a condition, plus realise that a year is a leap year or it isn't.
Remove the semicolon from line 70.
Also, consider putting the month data into an array & using a for loop to sum the values up to a given month. That way you can do the calculation in about 3 lines instead of 35. If you have a lot of repetition or tedious code, then there is probably a better way.
The leading zero's you have on the month values means that you have specified them in octal (base 8).
Line 75 can be written simply as
dayYear++;
there are also the +=, =, *=, /= operators (plus more) which you can use use if saying adding a number bigger than 1 for example:
1 2

MyNum += 5; // adds 5 to MyNum
MyNum *= 5; // multiplies MyNum by 5
 
Your leap year calculation isn't right  every 100th year isn't, but every 400th year is. This can be written as 1 statement.
Hope all goes well. :)