blocks skipped in "Latest Blocks" display

[gabegattis]

I just noticed this on test.bitpay.com.

[gabegattis]

It also shows age as "a few seconds ago" for blocks that were mined earlier than that.

[braydonf]

It's because the query is based on date and not block height, and since dates can be out of order, a block can exist on the previous/next day, or in the future, and not appear. It's more apparent on testnet.