The Perpetual Christian Calendar does not change any names and does not alter the months of the Julian calendar, i.e. an alignment of 31:28+:31:30:31:30:31:31:30:31:30:31 of its 365 days, 366 in leap years. It only changes the week cycle by introducing 15 or 16 irregularly spread eight-day weeks containing a Holiday after Saturday, which results in a perpetual calendar that has 50 weeks per year and every month date on the same day of the week every year, but the nth day of all months may occur on different weekdays, e.g. the first day falls on Sunday (Jan, Mar), Monday (Feb), Tuesday (Apr, May, Sep), Thursday (Jun, Jul, Oct) or Holiday (Aug, Nov, Dec).