The 12 month calendar which currently serves as the world standard of time is called the Gregorian Calendar, named for Pope Gregory XIIIth who "revised" the previous Julian calendar (which was named for Julius Caesar).
"The Gregorian calendar makes day-date calculations difficult. The twelve uneven months of the Gregorian calendar operate by a sub-system of 52 seven-day weeks, plus one day. Because of the irregularity of the numbering of the months, and because there are 365 and not 364 days in a year, it is almost impossible to make easy calculations month to month and year to year. For example, today on the Gregorian calendar is Tues, October 22. What day of the week will November 22 be? What day of the week will December 22 be? There is an immediate mental block - a numbing of the mind. You have to stop and think about it. And in this numbing pause in which your cognitive brain has to be engaged, you lose your telepathic awareness, much as when you look at a clock to find out "what time it is." By contrast, once the 28-day count is mastered, there is no need to engage the cognitive brain to figure out what day of the week it is - and so in this way the mind is liberated into a telepathic knowing." -Campaign for the New Time