Definition
exactly on a specified date or time; precisely.
精确地，恰好在（某时间）。
They signed the new agreement to the day the contract expired.
他们在新合约到期的当天签署了新协议。
The incident happened to the day of her birthday.
事件恰好发生在她的生日当天。
I remember our first meeting was ten years ago to the day.
我记得我们的第一次见面是十年前的今天。