I tested 2 ways of constructing date array. But I got two different
types of the arrays from the two ways. How can I make them the same?
What is the proper Date type? At least, I hope not to use the Any type.
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julia> dats = [date(2014, 7, ii) for ii=1:4]
4-element Array{Date{C<:Calendar},1}:
2014-07-01
2014-07-02
2014-07-03
2014-07-04
--------------------------
julia> dates
4-element DataArray{UTF8String,1}:
"2010/1/4"
"2010/1/5"
"2010/1/6"
"2010/1/7"
julia> [date(dates[i]) for i=1:length(dates)]
4-element Array{Any,1}:
2010-01-04
2010-01-05
2010-01-06
2010-01-07
