""Though I think no day amisse to undertake any good enterprise or businesse in hande, yet have I observed some, and no meane clerks, very cautionarie to forbeare these three Mundayes in the yeare, which I leave to thine owne consideration, either to use or to refuse; viz., 1. The first Munday in April, which Day Caine was born, and his brother Abel slaine. 2. The second Munday in August, which day Sodome and Gomorrah were destroyed. 3. The last Munday in December, which day Judas was born that betrayed our Saviour Christ.""- William Lord Burghley Note: The Bible says nothing aobut the days when these supposed events happened.
A range of superstitions (good and bad) are connected with particular dates in the various calendars. Some superstitions are idiosyncratic, only one person believes them. If a superstitious person gets good luck on a certain day he/she afterwards may decide that day is good for you. if someone get bad luck on a particular day that becomes an unlucky day. Other superstitions are more general and worth noting.
With the Christian calendar:
- Friday the 13th
- Friday generally. Many people thought Friday was an unlucky day generally, sailors for example often refused to set sale in a Friday. Chrales Dickens, however thought Friday was lucky for him.
- Superstitions round February 29th
Adapted from a deleted RationalWiki article