local luatz = require "luatz"

-- We do this a few times ==> Convert a timestamp to timetable and normalise
local function ts2tt ( ts )
	return luatz.timetable.new_from_timestamp ( ts )
end

-- Get the current time in UTC
local utcnow = luatz.time ( )
local now = ts2tt ( utcnow )
print ( now , "now (UTC)" )

-- Get a new time object 6 months from now
local x = now:clone ( )
x.month = x.month + 6
x:normalise ( )
print ( x , "6 months from now" )

-- Find out what time it is in Melbourne at the moment
local melbourne = luatz.get_tz ( "Australia/Melbourne" )
local now_in_melbourne = ts2tt ( melbourne:localise ( utcnow ) )
print ( now_in_melbourne , "Melbourne" )

-- Six months from now in melbourne (so month is incremented; but still the same time)
local m = now_in_melbourne:clone ( )
m.month = m.month + 6
m:normalise ( )
print ( m , "6 months from now in melbourne" )

-- Convert time back to utc; a daylight savings transition may have taken place!
-- There may be 2 results, but for we'll ignore the second possibility
local c1 , c2 = melbourne:utctime ( m:timestamp( ) )
print ( ts2tt ( c1 ) , "6 months from now in melbourne converted to utc" )