Bǐyìshí, cǐyìshí, xiànzài de qíngkuàng wánquán bùtóng le.
That was one time, this is another - the situation now is completely different.
Tips
history
From Mencius (《孟子·公孙丑下》): 「彼一时，此一时也」 - 'that was one time, this is another'. The full four-character set phrase 此一时彼一时 is the form most commonly used today, meaning circumstances have changed and old standards no longer apply.
