获取当前日期和时间:
以下是一个简单的例子，以获得当前的日期和时间：
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#!/usr/bin/ruby -w
time1 = Time.new
puts "Current Time : " + time1.inspect
# Time.now is a synonym:
time2 = Time.now
puts "Current Time : " + time2.inspect
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这将产生以下结果：
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Current Time : Mon Jun 02 12:02:39 -0700 2008
Current Time : Mon Jun 02 12:02:39 -0700 2008
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获取组件的日期和时间：
我们可以用 Time 对象来获取日期和时间的各个组成部分。下面的例子显示相同的：
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#!/usr/bin/ruby -w
time = Time.new
# Components of a Time
puts "Current Time : " + time.inspect
puts time.year # => Year of the date
puts time.month # => Month of the date (1 to 12)
puts time.day # => Day of the date (1 to 31 )
puts time.wday # => 0: Day of week: 0 is Sunday
puts time.yday # => 365: Day of year
puts time.hour # => 23: 24-hour clock
puts time.min # => 59
puts time.sec # => 59
puts time.usec # => 999999: microseconds
puts time.zone # => "UTC": timezone name
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这将产生以下结果：
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Current Time : Mon Jun 02 12:03:08 -0700 2008
2008
6
2
1
154
12
3
8
247476
UTC
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Time.utc，Time.gm和Time.local函数：
可用于这两个函数以标准格式来格式化日期如下：
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# July 8, 2008
Time.local(2008, 7, 8)
# July 8, 2008, 09:10am, local time
Time.local(2008, 7, 8, 9, 10)
# July 8, 2008, 09:10 UTC
Time.utc(2008, 7, 8, 9, 10)
# July 8, 2008, 09:10:11 GMT (same as UTC)
Time.gm(2008, 7, 8, 9, 10, 11)
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下面的例子，在一个数组来获取所有组件按以下格式：
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[sec,min,hour,day,month,year,wday,yday,isdst,zone]
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尝试以下操作：
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#!/usr/bin/ruby -w
time = Time.new
values = time.to_a
p values
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这将产生以下结果：
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[26, 10, 12, 2, 6, 2008, 1, 154, false, "MST"]
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这个数组可以传递给Time.utc或Time.local函数得到不同的日期格式如下：
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#!/usr/bin/ruby -w
time = Time.new
values = time.to_a
puts Time.utc(*values)
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这将产生以下结果：
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Mon Jun 02 12:15:36 UTC 2008
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跟随着的方式来获得内部表示（依赖于平台）历元以来的秒数时间：
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# Returns number of seconds since epoch
time = Time.now.to_i
# Convert number of seconds into Time object.
Time.at(time)
# Returns second since epoch which includes microseconds
time = Time.now.to_f
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时区和夏令时：
可以使用一个 Time 对象来获取相关的所有信息的时区和夏令如下：
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time = Time.new
# Here is the interpretation
time.zone # => "UTC": return the timezone
time.utc_offset # => 0: UTC is 0 seconds offset from UTC
time.zone # => "PST" (or whatever your timezone is)
time.isdst # => false: If UTC does not have DST.
time.utc? # => true: if t is in UTC time zone
time.localtime # Convert to local timezone.
time.gmtime # Convert back to UTC.
time.getlocal # Return a new Time object in local zone
time.getutc # Return a new Time object in UTC
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格式化时间和日期：
有各种各样的方式来格式化日期和时间。下面是一个例子，说明几个：
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#!/usr/bin/ruby -w
time = Time.new
puts time.to_s
puts time.ctime
puts time.localtime
puts time.strftime("%Y-%m-%d %H:%M:%S")
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这将产生以下结果：
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Mon Jun 02 12:35:19 -0700 2008
Mon Jun 2 12:35:19 2008
Mon Jun 02 12:35:19 -0700 2008
2008-06-02 12:35:19
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时间算术：
可以在时间上做简单的算术如下：
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now = Time.now # Current time
puts now
past = now - 10 # 10 seconds ago. Time - number => Time
puts past
future = now + 10 # 10 seconds from now Time + number => Time
puts future
diff = future - now # => 10 Time - Time => number of seconds
puts diff
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这将产生以下结果：
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Thu Aug 01 20:57:05 -0700 2013
Thu Aug 01 20:56:55 -0700 2013
Thu Aug 01 20:57:15 -0700 2013
10.0
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