今天是我的生日用英语怎么说过去式

今天是我的生日用英语是 "today is my birthday"。其过去式为 "today was my birthday"。这句话的来源是现在正在进行的今天是生日这一事实。
例句1：
English: Today was my birthday, but I didn't do anything special.
Chinese: 今天是我的生日，但我没有做任何特别的事情。
例句2:
English: Yesterday was my friend's birthday, so we went out to celebrate.
Chinese: 昨天是我朋友的生日，所以我们出去庆祝了。