Monthly update photos

When you take monthly update photos of your baby do you take them/post them to social media on the 4 week, 8 week, etc mark or do you literally go a month from the date they were born. For example, my daughter was born Tuesday, May 1st. So if I go 4 weeks from the day she was born, that would be Tuesday, May 29th. But if I go out exactly from the date it would be Friday, June 1st. I wasn’t sure which way to do it because when people ask me how old she is I say “she will be a month on Tuesday” which is 4 weeks from the day she was born. Just wasn’t sure which way everyone does it!