时区

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注意：以下代码只计算“现在”的时区偏移量，这与 os.date("%z") 不同，后者可以处理过去或将来的时间，并考虑夏令时。或者，您可以使用下面的 get_timezone_anystamp(ts)

-- Compute the difference in seconds between local time and UTC.
local function get_timezone()
  local now = os.time()
  return os.difftime(now, os.time(os.date("!*t", now)))
end
timezone = get_timezone()

-- Return a timezone string in ISO 8601:2000 standard form (+hhmm or -hhmm)
local function get_tzoffset(timezone)
  local h, m = math.modf(timezone / 3600)
  return string.format("%+.4d", 100 * h + 60 * m)
end
tzoffset = get_tzoffset(timezone)


--[[ debugging
for _, tz in ipairs(arg) do
  if tz == '-' then
    tz = timezone
  else
    tz = 0 + tz
  end
  print(tz, get_tzoffset(tz))
end
--]]

-- return the timezone offset in seconds, as it was on the time given by ts
-- Eric Feliksik
local function get_timezone_offset(ts)
	local utcdate   = os.date("!*t", ts)
	local localdate = os.date("*t", ts)
	localdate.isdst = false -- this is the trick
	return os.difftime(os.time(localdate), os.time(utcdate))
end

另请参阅

• LuaList:2008-03/msg00050.html