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Adding minutes in ruby without using Time Objects
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def add_minutes(time, signed_integer_minutes) | |
if time_regex = time.match(/(\d{1,2}+):(\d{2}+) (AM|PM)/) | |
total_minutes = time_regex[2].to_i + (signed_integer_minutes.abs % 60) | |
final_minutes = total_minutes % 60 | |
total_hours = time_regex[1].to_i + (signed_integer_minutes.abs / 60 % 60) + (total_minutes / 60 % 60) | |
final_modulo_hours = total_hours % 12 | |
final_hours = final_modulo_hours.zero? ? 12 : final_modulo_hours | |
half_of_day = ['AM', 'PM'] | |
final_half_of_day = half_of_day[(half_of_day.find_index(time_regex[3]) + (total_hours / 12 % 12)) % 2] | |
return "#{final_hours}:#{final_minutes.to_s.rjust(2,'0')} #{final_half_of_day}" | |
else | |
fail ArgumentError 'Date Format Error, please use [H]H:MM {AM|PM}' | |
end | |
end | |
require 'test/unit/assertions' | |
include Test::Unit::Assertions | |
assert_equal("12:33 PM", add_minutes("9:13 AM", 200)) | |
assert_equal("2:13 PM", add_minutes("9:13 AM", 300)) | |
assert_equal("3:53 PM", add_minutes("9:13 AM", 400)) | |
assert_equal("5:33 PM", add_minutes("9:13 AM", 500)) | |
assert_equal("7:13 PM", add_minutes("9:13 AM", 600)) | |
assert_equal("8:53 PM", add_minutes("9:13 AM", 700)) | |
assert_equal("10:33 PM", add_minutes("9:13 AM", 800)) |
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