HSK V7-9
Correct

届时

/ jièshí / 
Strokes

Definition

when the time comes/at the scheduled time

Example

As a Verb

when the time comes; at the appointed time; on the occasion

1
Jièshí
届时
wù
务
qǐng
请
guānglín
光临
  
。

Your presence is requested for the occasion.