I hate to break the news to the original poster but every quarter of a year consists of 13 weeks which when multiplied by 4 equals a full year of 52 weeks. It is for this reason, than many companies do their accounting on a 4-4-5 week quarter. Social Security payments are made on a monthly basis, not a 4 week month basis.
As to when a person receives their Social Security payments which are done by direct deposit now, it varies throughout the month in order to balance the workload of issuing the payments.
yup - 4/4/5 is answer