JavaScript in Adobe Acrobat Pro

[Nanaia]

I use Adobe to fill in time sheets. I figured out how to have it total the hours entered for the time period, but can't get it to calculate the hours for me. There are separate fields for time in (start shift), time out (lunch), time in (after lunch), and time out (end of shift). I've tried subtracting [ (end of shift-after lunch)+(lunch-start shift) ] in the following format using the field names (TIME OUTMON_2-TIME INMON_2)+(TIME OUTMON-TIME INMON) but keep getting a SyntaxError: missing ) in parenthetical 1: at line 2 error. I have nothing entered in JavaScript. My formula is one line. I understand that SyntaxError means I have something written incorrectly, however I can't find information on what might be incorrect. My JavaScript is novice at best although I have done some Python (not much). Can anyone tell me what I'm missing? I have the feeling I'm trying too much to make the formula like Excel but don't know how to change it.