julia> target
10-element Array{AnchoredInterval{-1 hour,ZonedDateTime},1}:
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 12, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 12, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 13, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 13, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 14, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 14, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 12, 8, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 12, 8, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 13, 8, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 13, 8, tz"UTC"), Inclusivity(false, true))

julia> a = union(target)
3-element Array{AbstractInterval,1}:
 Interval{ZonedDateTime}(ZonedDateTime(2013, 2, 12, 6, tz"UTC"), ZonedDateTime(2013, 2, 12, 8, tz"UTC"), Inclusivity(false, true))
 Interval{ZonedDateTime}(ZonedDateTime(2013, 2, 13, 6, tz"UTC"), ZonedDateTime(2013, 2, 13, 8, tz"UTC"), Inclusivity(false, true))
 Interval{ZonedDateTime}(ZonedDateTime(2013, 2, 14, 6, tz"UTC"), ZonedDateTime(2013, 2, 14, 7, tz"UTC"), Inclusivity(false, true))

julia> b = union!(target)
5-element Array{AnchoredInterval{-1 hour,ZonedDateTime},1}:
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 12, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 13, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 14, 7, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 12, 8, tz"UTC"), Inclusivity(false, true))
 AnchoredInterval{-1 hour,ZonedDateTime}(ZonedDateTime(2013, 2, 13, 8, tz"UTC"), Inclusivity(false, true))