I weigh in at 9.30 am but get up close to 6.30-7 ... I dont eat or drink anything before i weigh in! never have, i take food to the meeting and eat it there like a banana
My mum does sw and weighs in late, she doesn't eat/drink after 2/3pm ..
but obv theres not a right or wrong way to do it, but chose one way or the other and stick to it