Summary

i set start_time,but it not work

Steps to reproduce

i set start_time==18,but it start from 0

Debug info

• Streamlit version: (get it with $ streamlit version)
  Streamlit, version 0.64.0

• Python version: (get it with $ python --version)
  Python 3.6.5 :: Anaconda, Inc.

• Using Conda? PipEnv? PyEnv? Pex?
  Anaconda

• OS version:
  win10

• Browser version:
  Google Chrome 已是最新版本
  版本 84.0.4147.105（正式版本） （64 位）