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42 lines
1.4 KiB
Lua
42 lines
1.4 KiB
Lua
local new_timetable = require"luatz.timetable".new
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--- Parse an RFC 3339 datetime at the given position
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-- Returns a time table and the `tz_offset`
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-- Return value is not normalised (this preserves a leap second)
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-- If the timestamp is only partial (i.e. missing "Z" or time offset) then `tz_offset` will be nil
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-- TODO: Validate components are within their boundarys (e.g. 1 <= month <= 12)
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local function rfc_3339(str, init)
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local year, month, day, hour, min, sec, patt_end = str:match(
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"^(%d%d%d%d)%-(%d%d)%-(%d%d)[Tt](%d%d%.?%d*):(%d%d):(%d%d)()", init) -- luacheck: ignore 631
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if not year then
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return nil, "Invalid RFC 3339 timestamp"
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end
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year = tonumber(year, 10)
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month = tonumber(month, 10)
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day = tonumber(day, 10)
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hour = tonumber(hour, 10)
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min = tonumber(min, 10)
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sec = tonumber(sec, 10)
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local tt = new_timetable(year, month, day, hour, min, sec)
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local tz_offset
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if str:match("^[Zz]", patt_end) then
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tz_offset = 0
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else
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local hour_offset, min_offset = str:match("^([+-]%d%d):(%d%d)", patt_end)
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if hour_offset then
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tz_offset = tonumber(hour_offset, 10) * 3600 + tonumber(min_offset, 10) * 60
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else -- luacheck: ignore 542
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-- Invalid RFC 3339 timestamp offset (should be Z or (+/-)hour:min)
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-- tz_offset will be nil
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end
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end
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return tt, tz_offset
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end
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return {
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rfc_3339 = rfc_3339,
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}
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