DateTime's parsing causes Domain Error

[portig]

dt = DateTime("2017-Mar-17 00:00:00.0000", "y-u-d H:M:S.s")

This statement causes the Domain Error in both Julia 0.6 rc1 and rc2 with the following traceback:

ERROR: DomainError:
Cannot raise an integer x to a negative power -n. 
Make x a float by adding a zero decimal (e.g. 2.0^-n instead of 2^-n), or write 1/x^n, float(x)^-n, or (x//1)^-n.
Stacktrace:
 [1] power_by_squaring(::Int64, ::Int64) at ./intfuncs.jl:170
 [2] tryparsenext at ./dates/io.jl:114 [inlined]
 [3] tryparsenext at ./dates/io.jl:42 [inlined]
 [4] macro expansion at ./dates/parse.jl:65 [inlined]
 [5] tryparsenext_core(::String, ::Int64, ::Int64, ::DateFormat{Symbol("y-u-d H:M:S.s"),Tuple{Base.Dates.DatePart{'y'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'u'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'d'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'H'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'M'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'S'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'s'}}}, ::Bool) at ./dates/parse.jl:39
 [6] macro expansion at ./dates/parse.jl:153 [inlined]
 [7] tryparsenext_internal(::Type{DateTime}, ::String, ::Int64, ::Int64, ::DateFormat{Symbol("y-u-d H:M:S.s"),Tuple{Base.Dates.DatePart{'y'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'u'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'d'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'H'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'M'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'S'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'s'}}}, ::Bool) at ./dates/parse.jl:129
 [8] parse(::Type{DateTime}, ::String, ::DateFormat{Symbol("y-u-d H:M:S.s"),Tuple{Base.Dates.DatePart{'y'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'u'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'d'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'H'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'M'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'S'},Base.Dates.Delim{Char,1},Base.Dates.DatePart{'s'}}}) at ./dates/parse.jl:270
 [9] DateTime(::String, ::String) at ./dates/io.jl:403

This was working fine in Julia 0.5

[quinnj]

@omus @shashi

[stevengj]

Presumably this line should be:

ms = Nullable{Int64}(round(Int64, get(ms) * exp10(3 - (ii - i))))

[omus]

I'll try to deal with this tomorrow