Description
mixed 
jddayofweek ( int julianday, int mode)
     Returns the day of the week.  Can return a string or an integer
     depending on the mode.
     
表格 1. Calendar week modes
| Mode | Meaning | 
|---|
| 0 | Returns the day number as an int (0=Sunday, 1=Monday, etc) | 
| 1 | Returns string containing the day of week
          (English-Gregorian) | 
| 2 | Returns a string containing the abbreviated day of week
          (English-Gregorian) |