Confusion about the block time

As shown in the figure below, in a block with a height of 390005, why is the block time a negative number?

WechatIMG168.jpeg2872×1400 827 KB

might due to the incorrect utc time setting of some validator nodes. you might be able to get some evidence in consensus rpc endpoint on 26657.

https://figment.network/cosmos/hubble/gaia-8001/blocks/390005.json?kind=commit

{“validator_address”:“570B6A755ED339EAC56BB3390A48069F6AC9449B”,“validator_index”:“26”,“height”:“390005”,“round”:“0”,“timestamp”:“2018-09-20T07:07:50.502795992Z”,“type”:2,“block_id”:{“hash”:“5392D5A7809BF231BAC7F1F6DD661D77AA19EE4B”,“parts”:{“total”:“1”,“hash”:“BC96BAA0ACF43347C03E526E5ABE4316197115D5”}},“signature”:"Vp2TWpieQHE8lxi8+uVHDSueABNXIjR6wxIqFckZ9HX5T19Qj4oXi5NPH+G2CDY

I get it, thank u for your reply.