"You computer's clock is not synced" pop-up dialog keep appearing on start up

Version: `0.11.1`
OS & Version: Antergos Linux (arch linux)
Node version: `geth 1.8.13`

When starting Ethereum Wallet or Mist, the "You computer's clock is not synced" message dialog keeps showing up.

The message dialog said I need to install ntp, and I did, but the problem still persists.