If I type in 1/2, that means 1 divided by 2, or 0.5. If I then type +1, that means add 1.
1/2 I should never mean any kind of date, unless I'm entering it into a field that has already been declared a date field, or I have written that, then declared the field to be a date field.
1/2 I should never mean any kind of date, unless I'm entering it into a field that has already been declared a date field, or I have written that, then declared the field to be a date field.