を作れるが、最小単位が 1日単位である

ので、自分的には、使いにくい

もっと細かく分割できてほしい

@startgantt
  hide footbox
  Project starts 2021-11-30
  [12月上旬] starts 2021-12-01 and ends 2021-12-10
  [12月中旬] starts 2021-12-11 and ends 2021-12-20
  [12月下旬] starts 2021-12-21 and ends 2021-12-31
  -- 行事 --
  [冬至] happens 2021-12-22
  [クリスマス] starts 2021-12-24 and ends 2021-12-25
  [仕事納め] happens 2021-12-28   
  [大晦日] happens 2021-12-31   
 @endgantt

@startgantt
  hide footbox
  Project starts 2021-12-31
  [1月上旬] starts 2022-01-01 and ends 2022-01-10
  note bottom
    memo1 ...
    memo2 ...
    explanations1 ...
    explanations2 ...
  end note
  [1月中旬] starts 2022-01-11 and ends 2022-01-20
  [1月下旬] starts 2022-01-21 and ends 2022-01-31
  -- 行事 --
  [正月] starts 2022-01-01 and ends 2022-01-03
  [仕事始め] happens 2022-01-04
  [七草] happens 2022-01-07
  [成人の日] happens 2022-01-10
  caption これはキャプションです
@endgantt