It's really easy to set or change the dates for moments in the timeline:
When viewing moments
Even when moments are already in the timeline, you can change the date.
Step 1: Just tap on the photo, video or story you want to change.
Step 2: Tap on the 'Menu' button on the top (circled in red below):
Step 3: Tap on 'Date' (see below) and select the correct date:
Step 4: Select correct date - and Done!
Still have a question or suggestion? Just drop us a line at firstname.lastname@example.org - we LOVE to help :-)