i got TimeField with label 开始生效时间 not found,Why?how do i ues timeField api

[labulakaupppppp]

Pic1

Pic2:

the page just like this picture, when i click the input type=text which text us "开始生效时间",the timefield will open
My question 1:
code: await click('开始生效时间'); but the timeField is not open

My question 2:
i open the timeField my hand and input code like:
await write (timeStr,into(timeField('开始生效时间')))
and i got an error 【Error: TimeField with label 开始生效时间 not found, run .trace for more info】
so i want to know ,how can i input the time into the timeField?
Thank you very much!