It was generally agreed among the Weasley clan that while the school year officially began on September 1st, the school year of 2019-2020 did not. However, they all had different interpretations of when it actually did begun.
For Teddy it was in late June. Both Molly and Dominique agreed that it started on August 1st, a full month before the train ride back to the Scottish castle. James and Fred agreed that it began on the 29th, after a raid at Weasley’s Wizard Wheezes. Rose refused to acknowledge her own birthday as the beginning of a term, like Lily, Roxanne and Hugo argued, and rather advocated for August the 15th to be the first day of this disastrous term. Lucy and Louis agreed with Rose, though for an entirely different reason.
It was generally agreed among the Weasley clan that the school year of 2019-2020 didn’t begin on September 1st, but for Albus it actually did.
For Victoire it didn’t begin at all. But more on that later.”
— the beginning of a fanfic i may or may not write.