"Next year we will have been married for 30 years" and "Next year we will be married for 30 years."

Question

What's the difference between these senteces?

Next year we will have been married for 30 years.

Next year we will be married for 30 years.

Answer 1

The first sentence is correct because it indicates that 30 years have passed since the couple wed, while the second one implies that next year a wedding ceremony will take place which will last for 30 years.