..the day after tomorrow & the day before yesterday.. (আগামী/গত) পরশুদিন

the day after tomorrow = আগামী পরশুদিন

the day before yesterday = গত পরশুদিন

Examples:

আগামী পরশুদিন আমরা দেখা করবো। = We’re gonna meet the day after tomorrow.

গত পরশুদিন তাকে সেখানে দেখেছিলাম। = I saw him there the day before yesterday.

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If today is 6^th oct, then 8^th oct will be called ‘the day after tomorrow’ and 4^th oct was called ‘the day before yesterday’

So, the day after tomorrow = two days later

&  the day before yesterday =  two days earlier

Examples:

1. We’re gonna meet the day after tomorrow. (We’re gonna meet two days later.)

2. I saw him the day before yesterday. (I saw him two days earlier.)