intersect does not work with StepRange{<:AnchoredInterval}

[sdl1]

With StepRange{Int} it works as expected:

julia> intersect(1:1:5, 2:1:7)
2:1:5

With StepRange{<:AnchoredInterval} it does not work:

julia> dt = DateTime(2018, 1, 1);

julia> a = HE(dt):Hour(1):HE(dt + Hour(5));

julia> b = HE(dt + Hour(2)):Hour(1):HE(dt + Hour(7));

julia> intersect(a, b)
ERROR: MethodError: no method matching rem(::Millisecond, ::Hour)
Closest candidates are:
  rem(::Any, ::Any, ::RoundingMode{:ToZero}) at div.jl:67
  rem(::Any, ::Any, ::RoundingMode{:Down}) at div.jl:68
  rem(::Any, ::Any, ::RoundingMode{:Up}) at div.jl:69
  ...
Stacktrace:
 [1] intersect(::StepRange{AnchoredInterval{Hour(-1),DateTime,Open,Closed},Hour}, ::StepRange{AnchoredInterval{Hour(-1),DateTime,Open,Closed},Hour}) at ./range.jl:852
 [2] top-level scope at REPL[56]:1

The following works but returns a Vector rather than a StepRange:

julia> intersect(collect(a), b)
4-element Array{AnchoredInterval{Hour(-1),DateTime,Open,Closed},1}:
 AnchoredInterval{Hour(-1),DateTime,Open,Closed}(DateTime("2018-01-01T02:00:00"))
 AnchoredInterval{Hour(-1),DateTime,Open,Closed}(DateTime("2018-01-01T03:00:00"))
 AnchoredInterval{Hour(-1),DateTime,Open,Closed}(DateTime("2018-01-01T04:00:00"))
 AnchoredInterval{Hour(-1),DateTime,Open,Closed}(DateTime("2018-01-01T05:00:00"))

This is with julia 1.5.2 and Intervals 1.5.0

[omus]

The same issue exists with using DateTime:

julia> using Dates

julia> dt = DateTime(2018, 1, 1)
2018-01-01T00:00:00

julia> a = dt:Hour(1):dt + Hour(5);

julia> b = dt + Hour(2):Hour(1):dt + Hour(7);

julia> intersect(a,b)
ERROR: MethodError: no method matching rem(::Millisecond, ::Hour)
Closest candidates are:
  rem(::Any, ::Any, ::RoundingMode{:ToZero}) at math.jl:806
  rem(::Any, ::Any, ::RoundingMode{:Down}) at math.jl:807
  rem(::Any, ::Any, ::RoundingMode{:Up}) at math.jl:808
  ...
Stacktrace:
 [1] intersect(::StepRange{DateTime,Hour}, ::StepRange{DateTime,Hour}) at ./range.jl:807
 [2] top-level scope at REPL[7]:1

julia> intersect(collect(a), b)
4-element Array{DateTime,1}:
 2018-01-01T02:00:00
 2018-01-01T03:00:00
 2018-01-01T04:00:00
 2018-01-01T05:00:00

Note that the intersect function being called is from Base in both cases so if this issue is addressed by the Dates stdlib then this issue should also be addressed here.

Would you mind opening an issue in https://github.com/JuliaLang/julia?

[sdl1]

Thanks, good spot. I've opened this issue: JuliaLang/julia#39810
Closing this one.