This shouldn't be a problem.
Best to be a bit early though - especially if coming from a very different time zone - by the time she arrives, it might be 6am of the 24th.
This shouldn't be a problem.My partner has a Visitor Visa with a "must not arrive after 23 Jan 2019"
Am I correct in saying she can arrive right up until and inculding the 23 Jan, and will the be allowed to stay for the 3 months?
Does immigration ever give problems with this?
Thank you.