1. The day of the week of a date is not fixed. It shifts from year to year.

Example: January 1 this year may be Monday. Next year, it may be Tuesday. The same is true with a person's birthday.

  1. The date of a day is not fixed. It changes from year to year.

Example: Start of school term is last Monday of January. This year, it may fall on January 30. Next year, it may be on January 29.

  1. The calendar's divisions of months, quarters and half-years are less uniform and have greater differences. The number of days varies from 28 to 31 in a month, 90 to 92 in a quarter, and 181 to 184 in a half-year. These inconsistencies in the length of the periods cause many difficulties in statistics and economic planning.
  2. Christmas Day is celebrated on the wrong date.
  3. Easter, a movable feast celebrating the resurrection of Jesus, wanders to different dates in March and April because it is based on the full moon around vernal equinox (March 21). Comparing these months with each other and with the corresponding months in previous year is difficult.
  4. To the superstitious, the 13th can fall on a Friday which maybe declared unlucky.  This occurs at least once every year.  The maximum number of Friday the 13th is three occurring in February, March and November in a common year, and in January, April and October in a leap year.
  5. To look up dates, a calendar every year or a calendar table is needed.


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