one mo time
add logo and add some style
use date instead of time
use start_date/end_date
fix total_hours and use start_date/end_date
implement new daterange with dates instead of time
Merge branch 'daterange_refactor'

* daterange_refactor:
  implement new daterange with dates instead of time
  fix total_hours and use start_date/end_date
  use start_date/end_date
  use date instead of time
add onChange event for dates
tweak styles