Maybe you want https://github.com/quinnj/TimeZones.jl ?
On Wednesday, 8 July 2015 15:59:33 UTC+1, Tom Breloff wrote: > > I have some code which requires figuring out the number of seconds from > the Epoch until midnight (local time) in order to quickly compute the local > TimeOfDay. The reason is that I get passed a field which is seconds since > Epoch, and I'd like to just subtract off the (cached) # seconds from > Epoch-->Midnight. > > Since I'm using a cached number, I don't care so much how long it takes to > calculate. Right now I use both Dates and Calendar.jl, but I'm wondering > if I can accomplish this without the dependency on Calendar.jl (which I > currently use ONLY to get the hours offset between Eastern US and UTC). Is > there a better way to write this function? > > > function getHoursAdjustmentFromUTC(year::Integer, month::Integer, > day::Integer) > millisEST = *Calendar.ymd*(year, month, day, "EST5EDT").millis > millisUTC = *Calendar.ymd*(year, month, day, "UTC").millis > UInt64(round((millisEST - millisUTC) / (secondsInOneHour * > millisInOneSecond))) > end > > getEpochMillis() = UInt64(DateTime(1970,1,1).instant.periods.value) > createUTCDateTimeFromSecondsSinceEpoch(secondsSinceEpoch::Integer) = > DateTime(Dates.UTM(secondsSinceEpoch * millisInOneSecond + > getEpochMillis())) > > > # this is the function I care about... note that "midnight" refers to > midnight local to Eastern US > function calcSecondsEpochToMidnight(secondsSinceEpoch::Integer) > > dt = createUTCDateTimeFromSecondsSinceEpoch(secondsSinceEpoch) > > # get the hour adjustment using the Calendar module > y = Dates.year(dt) > m = Dates.month(dt) > d = Dates.day(dt) > hourAdjustment = getHoursAdjustmentFromUTC(y, m, d) > > millisMidnightUTC::UInt64 = DateTime(y, m, d).instant.periods.value > millisMidnightEST::UInt64 = millisMidnightUTC + hourAdjustment * > secondsInOneHour * millisInOneSecond > > return UInt64((millisMidnightEST - getEpochMillis()) / millisInOneSecond) > end > > >
