The Portuguese were some of the first colonizers / missionaries in the Far East. In the case of Vietnam, they created the first phonetic transcription of the language. Interestingly, nowadays the Vietnamese use numbers for days of the week in almost exactly the same way as the Portuguese. Both languages have an exception for Sunday (domingo and chủ nhật in Portuguese and Vietnamese, respectively). They also regard Monday as the second day of the week.
So, did Portuguese indeed influence Vietnamese in that matter?
Did Portuguese influence Chinese too? I am aware of this question, as the Chinese also use numbers for the days of the week (even though Monday is marked with number 1).