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Allow constructing a FixedTimeZone from Dates.UTC and allow passing it to ZonedDateTime #109

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Allow constructing a FixedTimeZone from Dates.UTC and allow passing it to ZonedDateTime #109

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2 changes: 2 additions & 0 deletions src/conversions.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@ import Compat.Dates: now, julian2datetime, unix2datetime
# UTC is an abstract type defined in Dates, for some reason
const utc_tz = FixedTimeZone("UTC")

FixedTimeZone(::UTC) = utc_tz

"""
DateTime(::ZonedDateTime) -> DateTime

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4 changes: 4 additions & 0 deletions src/types.jl
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Expand Up @@ -172,6 +172,10 @@ function ZonedDateTime(dt::DateTime, tz::FixedTimeZone; from_utc::Bool=false)
return ZonedDateTime(utc_dt, tz, tz)
end

function ZonedDateTime(dt::DateTime, tz::UTC; from_utc::Bool=false)
return ZonedDateTime(dt, FixedTimeZone(tz); from_utc=from_utc)
end

"""
ZonedDateTime(dt::DateTime, tz::VariableTimeZone, occurrence::Integer) -> ZonedDateTime

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5 changes: 5 additions & 0 deletions test/conversions.jl
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Expand Up @@ -3,6 +3,11 @@ import Compat.Dates
utc = FixedTimeZone("UTC")
warsaw = resolve("Europe/Warsaw", tzdata["europe"]...)

# Converting from the stdlib UTC
@test FixedTimeZone(UTC()) == utc
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@omus omus Dec 21, 2017

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I'm not sure I want to support using an instance of UTC as this is never actually utilized in Base. In fact they only ever seem to use the type so maybe the type should be redefined as abstract or rethought.

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@iamed2 iamed2 Dec 21, 2017

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Your interface currently says it accepts any TimeZone :P

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@omus omus Dec 21, 2017

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Fair. This happens to be the only TimeZone I don't like 😆

dt = DateTime(2015, 1, 1, 0)
@test ZonedDateTime(dt, FixedTimeZone(UTC())) == ZonedDateTime(dt, utc)

# Converting a ZonedDateTime into a DateTime
dt = DateTime(2015, 1, 1, 0)
zdt = ZonedDateTime(dt, warsaw)
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