Normally dates will always use numbers. e.g.
C'est le 5 mai, nous sommes le 7 septembre , le 31 décembre...
In a text there are various rules including the one that numbers up to ten will be written using numbers. The others in their written form.
Also if at the beginning of a sentence a number will be spelt out.
Vingt des 30 élèves ont échoué à ce test = Twenty out of 30 pupils failed that test
Hope this helps!
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