Such code will generate an error:
if(hr>t1[0]||(hr==t1[0]&&min=>t1[1]) && hr<t2[0]||(hr==t2[0]&&min<t2[1]))
The error:
SyntaxError: invalid arrow-function arguments (parentheses around the arrow-function may help)
What does it mean, how did it happen? Google searches for this error are desperately useless.
Edit:
Seems to be caused by using => instead of >=. But I'm still curious why is the error formulated like this, and what the arrow function is supposed to be.
Edit 2.
First, I didn't realise that this could actually be browser specific issue. Also, I didn't realise that these days, people use JS in other places than browser context. So, to make that clear, my browser is Mozilla Firefox 25.0.1.