Migrated photos from iPhoto to Photo. Dates and other information no longer available.
Then you did something wrong, How did you migrate? A correct migration does not lose any of that information - https://discussions.apple.com/docs/DOC-9721
Photos not sorted in date order.
And photos are sorted in different orders depending on where you are looking - in Photo they are in photo date order with the newest last, in Imports they are date of import to Photo order with the newest last, in user albums they can be in photo date order ascending or descending or alpha title sort
Tried to follow various instructions for migration but found it too, too difficult.
Sorry if these are too difficult for you - they are really simple so since they are "too, too difficult" for you you seriously need to go take some training classes
LN