当天

tā shì zuó tiān dào de dàng tiān jiù zǒu le

她是昨天到的，当天就走了。

She arrived yesterday and returned the same day.

wǒ men kě yǐ dàng tiān huí lái

我们可以当天回来。

We can go and come back on the same day.

xiān qiǎn duì zài dì zhèn dàng tiān jiù dǐ dá le zāo shòu zhòng chuàng de xiàn

先遣队在地震当天就抵达了遭受重创的县。

Advance units arrived in the battered county on the same day of the quake.