如果我在Ruby中有一个时间变量,如何表达它是指以下事件之一:
“x分钟前”或“x小时前”或“x天前”
显然,如果某件事情2天前发生了,我不想说它发生在几分钟前。
“x分钟前”或“x小时前”或“x天前”
显然,如果某件事情2天前发生了,我不想说它发生在几分钟前。
这是一个与语言无关的版本,您应该能够将其转换为任何语言:
ONE_MINUTE = 60
ONE_HOUR = 60 * ONE_MINUTE
ONE_DAY = 24 * ONE_HOUR
ONE_WEEK = 7 * ONE_DAY
ONE_MONTH = ONE_DAY * 3652425 / 120000
ONE_YEAR = ONE_DAY * 3652425 / 10000
def when(then):
seconds_ago = now() - then
if seconds_ago < 0:
return "at some point in the future (???)"
if seconds_ago == 0:
return "now"
if seconds_ago == 1:
return "1 second ago"
if seconds_ago < ONE_MINUTE:
return str(seconds_ago) + " seconds ago"
if seconds_ago < 2 * ONE_MINUTE:
return "1 minute ago"
if seconds_ago < ONE_HOUR:
return str(seconds_ago/ONE_MINUTE) + " minutes ago"
if seconds_ago < 2 * ONE_HOUR:
return "1 hour ago"
if seconds_ago < ONE_DAY:
return str(seconds_ago/ONE_HOUR) + " hours ago"
if seconds_ago < 2 * ONE_DAY:
return "1 day ago"
if seconds_ago < ONE_WEEK:
return str(seconds_ago/ONE_DAY) + " days ago"
if seconds_ago < 2 * ONE_WEEK:
return "1 week ago"
if seconds_ago < ONE_MONTH:
return str(seconds_ago/ONE_WEEK) + " weeks ago"
if seconds_ago < 2 * ONE_MONTH:
return "1 month ago"
if seconds_ago < ONE_YEAR:
return str(seconds_ago/ONE_MONTH) + " months ago"
if seconds_ago < 2 * ONE_YEAR:
return "1 year ago"
return str(seconds_ago/ONE_YEAR) + " years ago"
注意,年/月数字是近似值(基于平均值),但这并不重要,因为相对误差仍然非常低。如果您使用的是 Rails:
time_ago_in_words
tnow = Time.now
elapsed = tnow - tevent # elapsed time in seconds
if (elapsed < 60)
puts "#{elapsed} seconds ago"
elsif (elapsed < 60*60)
puts "#{elapsed/60} minutes ago"
end
(
和 epapsed
都明显是打错了。 - Telemachus如果您选择超出完整的Rails范围,但愿意使用active_support(gem install actionview
),这里有一个完整的示例:
#!/usr/bin/env ruby
require 'active_support'
require 'active_support/core_ext/object/acts_like'
require 'active_support/core_ext/time/acts_like'
require 'action_view'
require 'date'
# Avoid a deprecation warning
I18n.enforce_available_locales = false
# Add time_ago_in_words
extend ActionView::Helpers::DateHelper
[
'2014-04-24 16:20:00',
'2014-04-21 16:20:00',
'2014-03-24 16:20:00',
'2013-04-20 16:20:00',
].map {|t| DateTime.parse t}.each do |time|
puts time_ago_in_words time
end
在撰写本文时,这将输出:
about 6 hours
3 days
about 1 month
about 1 year