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