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doc/index.md: Fix internal link
[etc/awesome.git] / examples / date_arithmetic.lua
1 local luatz = require "luatz"
2
3 -- We do this a few times ==> Convert a timestamp to timetable and normalise
4 local function ts2tt(ts)
5         return luatz.timetable.new_from_timestamp(ts)
6 end
7
8 -- Get the current time in UTC
9 local utcnow = luatz.time()
10 local now = ts2tt(utcnow)
11 print(now, "now (UTC)")
12
13 -- Get a new time object 6 months from now
14 local x = now:clone()
15 x.month = x.month + 6
16 x:normalise()
17 print(x, "6 months from now")
18
19 -- Find out what time it is in Melbourne at the moment
20 local melbourne = luatz.get_tz("Australia/Melbourne")
21 local now_in_melbourne = ts2tt(melbourne:localise(utcnow))
22 print(now_in_melbourne, "Melbourne")
23
24 -- Six months from now in melbourne (so month is incremented; but still the same time)
25 local m = now_in_melbourne:clone()
26 m.month = m.month + 6
27 m:normalise()
28 print(m, "6 months from now in melbourne")
29
30 -- Convert time back to utc; a daylight savings transition may have taken place!
31 -- There may be 2 results, but for we'll ignore the second possibility
32 local c, _ = melbourne:utctime(m:timestamp())
33 print(ts2tt(c), "6 months from now in melbourne converted to utc")