Day values: 0 - Sunday, 1 - Monday, 2 - Tuesday, 3 - Wednesday, 4 - Thursday, 5 - Friday, 6 - Saturday.
Page purge link (titles is the transcluded template or category containing pages to purge): https://en.wikipedia.org/w/api.php?action=purge&titles=cat/template&forcerecursivelinkupdate