BULATS has no fixed dates.

BULATS考试没有固定日期。

youdao

Package is valid for fixed dates departure and return.

适用于指定航班出发及回程。

youdao

Provisional Books or Itinerary of travel arrangements (Round trip ticket with fixed dates) is a must. Ticket should not be purchased before the visa is issued.

必须提供旅行安排的临时性预定或日程安排(日期固定的往返程票)。在签发签证以前不建议申请人购买机票。

youdao

Another idea is a formal system of booking operations on fixed dates.

ECONOMIST: Waiting for Dobbo

There are fixed dates for the tests for 11- and 14-year-olds, but test dates are not given out in advance for seven-year-olds, for whom the experience is supposed to be less formal.

BBC: Tests - a guide for parents

In July, the US space agency fixed the dates of its last shuttle flights.

BBC: Nasa Moonship flight target slips