iCloud Photos amended date not reflected across all devices

So I've imported a load a photos into my iCloud photos app on my macbook pro. Some of these I've had to amend the date and time of the photo as it was using the import date rather than the date the photo was taken. In the photos app on my MacBook the photos are then adjusted so in the Library view they show in the relevant year/month/day - all good at this point.

If I go into my photos app on my iPhone or iPad however there are photos that still have the import date. So my photos across my iPhone and iPad appear to look the same, but they don't reflect the dates on my MacBook.

How do I all all of my devices reflecting the same view???