Time range with reversed bounds

General Usage
, ,
6

Using the various Iterator tools:

using Iterators
using IterTools
using Dates

maprepeateduntil(mapfn, condfn, stepfn, initval) = 
  Iterators.map(mapfn, 
    Iterators.takewhile(
      let done=false
        x->(t = done; done = condfn(x); !t)
      end, 
      IterTools.iterated(stepfn, initval)
    )
  )

iteratetimes(lb, ub, step) = 
  maprepeateduntil(
    Time, ==(ub)∘Time, 
    Base.Fix1(+, step), 
    DateTime(Date(now())+lb)
  )

with these in place:

julia> iteratetimes(lower_bound, upper_bound, Minute(1)) |> collect
3-element Vector{Time}:
 23:59:00
 00:00:00
 00:01:00

and

julia> iteratetimes(upper_bound, lower_bound, Minute(1)) |> collect |> 
  x->(display.(extrema(x)); length(x))
00:01:00
23:59:00
1439