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72 lines
2.7 KiB
Lua
72 lines
2.7 KiB
Lua
local DateTime = require("@lune/datetime")
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local now = DateTime.now()
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local nowIso = now:toIsoDate()
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-- Make sure we have separator characters, T to separate date & time, + or Z to separate timezone
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local dateTimeSplitIdx = string.find(nowIso, "T")
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local timezoneSplitIdx = string.find(nowIso, "+")
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local timezoneZeroedIdx = string.find(nowIso, "Z")
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assert(dateTimeSplitIdx ~= nil, "Missing date & time separator 'T' in iso 8601 string")
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assert(
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timezoneSplitIdx ~= nil or timezoneZeroedIdx ~= nil,
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"Missing timezone separator '+' or 'Z' in iso date string"
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)
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-- Split date (before T) by dashes, split time (after T, before + or Z)
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-- by colons, we should then get 3 substrings for each of date & time
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local dateParts = string.split(string.sub(nowIso, 1, dateTimeSplitIdx - 1), "-")
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local timeParts = string.split(
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string.sub(
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nowIso,
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dateTimeSplitIdx + 1,
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((timezoneSplitIdx or timezoneZeroedIdx) :: number) - 1
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),
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":"
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)
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assert(#dateParts == 3, "Date partial of iso 8601 should consist of 3 substrings, separated by '-'")
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assert(#timeParts == 3, "Time partial of iso 8601 should consist of 3 substrings, separated by ':'")
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-- date should be in format YYYY:MM::DD
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-- time should be in format HH:MM:SS with optional fraction for seconds
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assert(string.match(dateParts[1], "^%d%d%d%d$"), "Date partial should have 4 digits for year")
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assert(string.match(dateParts[2], "^%d%d$"), "Date partial should have 2 digits for month")
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assert(string.match(dateParts[3], "^%d%d$"), "Date partial should have 2 digits for day")
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assert(string.match(timeParts[1], "^%d%d$"), "Time partial should have 2 digits for hour")
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assert(string.match(timeParts[2], "^%d%d$"), "Time partial should have 2 digits for minute")
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assert(
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string.match(timeParts[3], "^%d%d%.?%d*$") and tonumber(timeParts[3]) ~= nil,
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"Time partial should have minimum 2 digits with optional fraction for seconds"
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)
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-- Timezone specifier is either 'Z' for zeroed out timezone (no offset),
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-- in which case we don't need to check anything other than it being the
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-- last character, or it can be a timezone offset in the format HH::MM
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if timezoneZeroedIdx ~= nil then
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-- No timezone offset
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assert(
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timezoneZeroedIdx == #nowIso,
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"Timezone specifier 'Z' must be at the last character in iso 8601 string"
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)
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elseif timezoneSplitIdx ~= nil then
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-- Timezone offset
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local timezoneParts = string.split(string.sub(nowIso, timezoneSplitIdx + 1), ":")
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assert(#timezoneParts == 2, "Timezone partial should consist of 2 substings, separated by ':'")
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assert(
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string.match(timezoneParts[1], "^%d%d$"),
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"Timezone partial should have 2 digits for hour"
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)
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assert(
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string.match(timezoneParts[2], "^%d%d$"),
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"Timezone partial should have 2 digits for minute"
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)
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else
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error("unreachable")
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end
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