anchor.diff:                  ul.weeks-in-month
                       li
                           span.month May
  -                        , 
  -                        span.year 2015
  -                    li
  -                        span.month June
  -                        , 
  -                        span.year 2015
  -                pre.
  +                        | , 
  +                        span.year 2015
  +                    li
  +                        span.month June
  +                        | , 
  +                        span.year 2015
  +                pre. 
                       elrTime.getWeeksInMonth(month, year);
                       elrTime.getWeeksInMonth(5, 2015); // 6
                       elrTime.getWeeksInMonth(4, 2015); // 5
  
positive.code:                 ul.next-month
                      li
                          span.month June
                          &nbsp;
                          span.date 20
                          ,&nbsp;
                          span.year 2015
                      li
                          span.month January
                          &nbsp;
                          span.date 01
                          ,&nbsp;
                          span.year 2015
                      li
                          span.month December
                          &nbsp;
                          span.date 31
                          ,&nbsp;
                          span.year 2015
                  pre.
                      
              .elr-col-full
                  h3 Prev Date
  
negative.code:                 ul.first-day-of-month
                      li
                          span.month May
                          | , 
                          span.year 2015
                      li
                          span.month June
                          | , 
                          span.year 2015
                      li
                          span.month March
                          | , 
                          span.year 2004
                      li
                          span.month June
                          | , 
                          span.year 2006
                      li
                          span.month August
                          | , 
                          span.year 2007
                      li
                          span.month December
                          | , 
                          span.year 2015
                  pre. 
                      elrTime.getFirstDayOfMonth(month, year);
                      elrTime.getFirstDayOfMonth(5, 2015); // 1
                      elrTime.getFirstDayOfMonth(4, 2015); // 5
  