a week ago last Sunday

先々週
the week before last

先々週に
two weeks ago

先々週の土曜日
a week ago last Saturday

先々週の日曜日
a week ago last Sunday

先々週の月曜日
a week ago last Monday

先々週の木曜日
a week ago last Thursday

先々週の水曜日
a week ago last Wednesday

先々週の火曜日
a week ago last Tuesday

先々週の金曜日
a week ago last Friday

先週と先々週
last week and the week before （that）