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#!/usr/bin/env lua
--[[
Challenge 100
TASK #1 > Fun Time
Submitted by: Mohammad S Anwar
You are given a time (12 hour / 24 hour).
Write a script to convert the given time from 12 hour format to 24 hour format
and vice versa.
Ideally we expect a one-liner.
Example 1:
Input: 05:15 pm or 05:15pm
Output: 17:15
Example 2:
Input: 19:15
Output: 07:15 pm or 07:15pm
--]]
function convert_time(text)
text = string.lower(text)
local hour, minute = string.match(text, "(%d+):(%d+)")
hour = tonumber(hour)
minute = tonumber(minute)
local am = string.match(text, "am")
local pm = string.match(text, "pm")
if am or pm then
-- 12->24
if pm then
if hour < 12 then
hour = hour + 12
end
else
if hour == 12 then
hour = 0
end
end
return string.format("%02d:%02d", hour, minute)
else
-- 24->12
local ampm = "am"
if hour == 0 then
hour = 12
elseif hour == 12 then
ampm = "pm"
elseif hour > 12 then
hour = hour - 12
ampm = "pm"
end
return string.format("%02d:%02d%s", hour, minute, ampm)
end
end
io.write(convert_time(arg[1]))
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