Julian - Monday-based week with week numbers
        September 2006        
   Mon Tue Wed Thu Fri Sat Sun
35                 244 245 246
36 247 248 249 250 251 252 253
37 254 255 256 257 258 259 260
38 261 262 263 264 265 266 267
39 268 269 270 271 272 273