What's the date or when is the date?
elimika
The "what" is asking for a specific name / figure denoting a point in time, and the "when" is actually asking for a point in time - the answer does not have to take the form of a date. For example you could answer "tomorrow", or "in 4 weeks", whereas the first question specifically asks for a date
Both are correct. Likewise, What is the DEADLINE? or When is the DEADLINE?
2
In casual, every day use, both would be fine, but if you want to be strict, you would either say:
"What is the due date for this assignment" or "When is this assignment due?"
The "what" is asking for a specific name / figure denoting a point in time, and the "when" is actually asking for a point in time - the answer does not have to take the form of a date. For example you could answer "tomorrow", or "in 4 weeks", whereas the first question specifically asks for a date.