I downloaded a lot of photos of a wedding in several batches, with the most 'urgent' downloaded first. Because Irista presents photos taken on the same date in reverse order of downloading I now have a thoroughly jumbled timeline, darting backwards and forwards between the ceremony, reception, pre-wedding preparations, etc. I can't believe that there is no mechanism for sorting the photo order apart from changing the dates on each photo.
Having taken a series of wedding photos on one day I can't get them ordered to show the progress of the day. So I am stuck with a mixture of ceremony, reception and evening party shots that bear no relation to the order in which they were shot. The only way round this would be to upload the photos one at a time in reverse order to the order in which they were shot. Not really a practicable solution!
I have a series of wedding photographs shot on one date but they appear randomly in the gallery, so give no impression of the way the day proceeded. Being able to edit the time for each photo would solve this.