Yes, you can extend your goal end date. You can do so by clicking on "Edit Goal" in Goal Details section.
Related Question
Can I do mutliple investments against one goal?
Is there any penalty if I miss RD payments towards my goal?
Can I stop SIPs midway before goal is completed?
How is OnTrack or OffTrack status decided for my goal?
Is there any penalty if I miss SIP payments towards my goal?
I am unable to delete my goal.
My goal got deleted automatically
How is the suggested amount to invest calculated?
Can I invest a lesser amount than the suggested amount?
Can I withdraw my savings before my goal is completed?
Can I extend my goal end date?
Yes, you can extend your goal end date. You can do so by clicking on "Edit Goal" in Goal Details section.