VERSION

using ICU
using Calendar
n=now()

whos(ICU)

ICU.getDefaultTimeZone()

ICU.getNow() #epoch in milliseconds as a Float64

zcal=ICU.ICUCalendar("UTC")
dump(zcal)

lcal=ICU.ICUCalendar()
dump(lcal)

ICU.get(zcal, UCAL_MONTH)

ICU.get(zcal, [UCAL_MONTH, UCAL_DATE, UCAL_YEAR, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET])'

ldt = ICU.get(lcal, [UCAL_MONTH, UCAL_DATE, UCAL_YEAR, UCAL_ZONE_OFFSET, UCAL_DST_OFFSET])'

# timezone offset in hours
ldt[4]/1000/3600

ICU.setDate(lcal, 2011, 11, 1)

millis = ICU.getMillis(lcal)

fmt=ICU.ICUDateFormat("yyyy", "UTC")

#ICU.format(ICUDateFormat, millis)
ifmt1 = ICU.format(fmt, millis)

ICU.getTimeZoneDisplayName(lcal)

whos(Calendar)

t0=Calendar.now()

t = ymd_hms(2013, 3, 10, 1, 59, 59)

typeof(t)

t + days(2)

delta =t0-t

t + delta

dump(delta)

s = Calendar.format("yyyy-MMMM-dd EEE HH:mm:ss x", t)

 t2 = Calendar.parse("yyyy-MMMM-dd EEE HH:mm:ss V", s)

timezone(t2, "UTC")

dayofyear(today())

println("Today is day $(dayofyear(today())) of the current year.")

println("Today is day $(dayofyear(today())) of $(year(today())).")

println("The date is $(today()).")

now()

epoch_dt = ymd_hms(1970,1,1,0,0,0,"UTC")

now() - epoch_dt

(now() - epoch_dt).millis

dt=now()

dump(dt)

dt.millis / 1000

function CalTime2epoch(caltime)
    return caltime.millis/1000
end

CalTime2epoch(today())

epoch_dt

epoch_time = time()

function epoch2CalendarTime(epoch)
    epoch_dt = ymd_hms(1970,1,1,0,0,0,"UTC")
    return epoch_dt + seconds(epoch)
end

epoch2CalendarTime(epoch_time)

mydate = ymd(2013,1,2)

println("One day in the future is $(mydate + days(1))")

println("Two weeks in the past is $(mydate + weeks(-2))")

dt2 = ymd(2013,2,14)
dt2 - mydate

birthtime = ymd_hms(1973,1,18,3,45,50)

then = birthtime + seconds(5)+minutes(17)+hours(2)+days(55)

println("Then is $then")

when = ymd(1973,1,18) + days(55)
println("Nat was 55 days old on $when")

diff = dt2 - mydate

dump(diff)

dt1 = now()

dt2 = now()

diff_dt = dt2-dt1

dump(diff_dt)

bree = ymd_hms(1981,6,16,4,35,25)
nat =  ymd_hms(1973,1,18,3,45,50)

dtdiff=bree-nat

dump(dtdiff)

dur2seconds(dur) = int(floor(dur.millis/1000)) 
dur2minutes(dur) = int(floor( (dur.millis/1000) / 60))
dur2hours(dur)   = int(floor( (dur.millis/1000) / 3600))
dur2days(dur)    = int(floor( (dur.millis/1000) / 86400 ))
dur2weeks(dur)   = int(floor( (dur.millis/1000) / 86400 / 7 ))

dur2days( dtdiff )

println("There were $(dur2days(dtdiff)) days between Nat and Bree")

wks  = dur2weeks(dtdiff)
days = dur2days(dtdiff)
netdays = days - wks*7
hrs = dur2hours(dtdiff)
nethours = hrs - days*24
mins = dur2minutes(dtdiff)
netmins = mins - 60*hrs
netsecs = dur2seconds(dtdiff) - 60*mins
wks,netdays, nethours, netmins, netsecs

println("$wks weeks, $netdays days, $nethours:$netmins:$netsecs")

when = ymd(1981,6,16)

dayofweek(when) # = Tuesday

year(when), month(when), day(when)

format("yyyy", when)

t = ymd_hms(2013, 3, 10, 1, 59, 59)

s = format("yyyy-MMMM-dd HH:mm:ss V", t)


#strftime("Today is Day %w of the week (a %A). Day %d of the month (%B)",Datetime.today())
td = today()
#('MMMM')'", td)
format("'Today is Day ' c ' of the week (a ' eeee'). '",td)  * format("'Day' d 'of the month ('MMMM').'",td) 

# Tuesday
#strftime("1981-06-16 was Day %w of the week (a %A). Day %d of the month (%B)",when)
format("'Today is Day ' c ' of the week (a ' eeee'). '",when)  * format("'Day' d 'of the month ('MMMM').'",when) 

format("'Today is Day ' c ' of the week (a ' eeee'). Day' d 'of the month ('MMMM').'",when) 

# day of year: 168, week of year=24
#strftime("Day %j of the year(%Y), in week %W of the year.",when)
format("'Day ' D ' of the year ('YYYY'), in week ' w 'of the year.'", when)

Calendar.parse("EEE MMM DD HH:mm:ss yyyy", "Tue Jun 16 20:18:03 1981")

#time.strptime("16/6/1981", "%d/%m/%Y")
Calendar.parse("DD/M/yyyy","16/6/1981")

cdt = Calendar.now()
Calendar.format("'The date is 'YYYY",cdt)

"""The date is $(Calendar.format(" EEEE (EEE) d/MM/yyyy",cdt))"""

Calendar.format("'The date is ' EEEE (EEE) d/MM/yyyy",cdt)

tic()

elapsed=toc()

# from https://github.com/JuliaLang/julia/issues/4478
function f1(n)
  sum = 0.0
  g1(k) = 1.0/k
  for i = 1:n
    sum += g1(i) 
  end
  sum
end

f1(99)

@time f1(1e6)

sleep(3.1) #sleep for 4 seconds

@time( sleep(3.1) )

;ipython nbconvert 3_pleac_datetime-calendar.ipynb