There is always a fascination among witchcraft practitioners with the art of timing -- the belief that performing a spell at a particular hour or day will give the spell an edge, such as the Planetary Hours and their derivative the Voodoo Hours used to decide when a magical working will be performed.
Naturally, there are also beliefs about the best days to perform spells. This listing comes from a Renaissance era grimoire, but which contains spells that date back to Greco-Roman era. (The book is for sale with the translation The Book of Oberon, though you can read the direct transcription for free via Esoteric Archives.) This is using standard calendar dates, so 1 is the 1st of the month, 31 is the 31st of the month, etc.
- Good to begin all manner of things
- For hate and enchantment against enemies
- "Right naught" -- don't plan for magical work on this day
- To enchant and conjure wicked spirits
- For invisibility, and enchant against enemies
- For works that regard theft and for knowledge of hidden goods
- Don't use this day
- For love of virgins (unmarried targets)
- Don't use
- Don't use
- In the afternoon, to enchant.
- For works of theft
- For works of love
- To go invisible
- Don't use
- For discord and strife
- For gaining love of women
- For theft
- For hate
- Don't use
- To go invisible
- For love
- For discord
- Don't use
- For enchantments
- For love
- For love
- "Naught for love" -- anti-love
- Anti-love
- Against enemies
- "Idem cum principio. Deo semper et ubique gloria." Trans: This as the first. Glory to God eternal and everywhere.