Current block: 1,785,988
Block halving every: 2,100,000

2,100,000 - 1,785,988 = 314,012 blocks

Block target: 1 min.

314,012 minutes ≈ 5,233.53 hours ≈ 218.06 days

So why time until next halving is 4 days and 6 hours on feathercoin.com?