    I have a vector that contains month and year in the format YYYYMM (e.g.“200701”, “200702”)

  I wish to do to things:
1. I need      to convert to a date that is the last calendar day of each month.

2. I need      to convert this to a date that is the last U.S. stock-exchange trading day      of each month.
            Any advice is appreciated,
  mymonths <- c(200701, 200702)  
       
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