treat datetime that fails to parse as string

Author: Shashi Gowda

src/guesstype.jl

@@ -25,7 +25,11 @@ function guessdateformat(str)
     dts = vcat(dts, Any[DateTime => d for d in common_datetime_formats])
 
     for (typ, df) in dts
-        x, len = tryparsenext_internal(typ, str, 1, endof(str), df)
+        x, len = try
+            tryparsenext_internal(typ, str, 1, endof(str), df)
+        catch err
+            continue
+        end
         if !isnull(x)
             try
                 typ(get(x)...)

test/runtests.jl

@@ -425,6 +425,7 @@ import TextParse: _csvread
     time,value
     "2017-11-09T07:00:07.391101180",0
     """
+    @test _csvread(s) == ((String["2017-11-09T07:00:07.391101180"], [0]), String["time", "value"])
     @test _csvread(s, colparsers=Dict(:time=>String)) == ((String["2017-11-09T07:00:07.391101180"], [0]), String["time", "value"])
 end