backdate
verb- backdate something
to write a date on a document that is earlier than the actual date 倒填日期（在支票等上签写比实际较早的日期） - backdate something (British English)
to make something, especially a payment, take effect from an earlier date 使（付款等）在较早的日期开始生效 Postal workers are getting a 5.2 per cent pay rise, backdated to February. 从2月份开始，邮政工人的工资将上涨5.2%。