From: daurnimator Date: Sun, 24 Nov 2013 11:04:38 +0000 (-0500) Subject: examples/date_arithmetic: Add an example that shows of date arithmetic X-Git-Url: https://git.madduck.net/etc/awesome.git/commitdiff_plain/bb4e81dc9fee098981ea7a036c892ae8ab9ddc49 examples/date_arithmetic: Add an example that shows of date arithmetic --- diff --git a/examples/date_arithmetic.lua b/examples/date_arithmetic.lua new file mode 100644 index 0000000..3b1126d --- /dev/null +++ b/examples/date_arithmetic.lua @@ -0,0 +1,33 @@ +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 ):normalise ( ) +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" )