1. Have a great week ahead!
2. Have a great weekend ahead!
Are they both grammatically correct?
Yes.
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talab12341. Have a great week ahead!
2. Have a great weekend ahead!
Are they both grammatically correct?
We never wish people a great day, week, or weekend when that day, week, or weekend has already passed, so the word 'ahead' seems anomalous to me. I would remove it. Otherwise, fine.
CJ