獲取當(dāng)前日期和時間:
以下是一個簡單的例子，以獲得當(dāng)前的日期和時間：
#!/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
這將產(chǎn)生以下結(jié)果：
Current Time : Mon Jun 02 12:02:39 -0700 2008
Current Time : Mon Jun 02 12:02:39 -0700 2008
獲取組件的日期和時間：
我們可以用 Time 對象來獲取日期和時間的各個組成部分。下面的例子顯示相同的：
#!/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
這將產(chǎn)生以下結(jié)果：
Current Time : Mon Jun 02 12:03:08 -0700 2008
2008
6
2
1
154
12
3
8
247476
UTC
Time.utc，Time.gm和Time.local函數(shù)：
可用于這兩個函數(shù)以標(biāo)準(zhǔn)格式來格式化日期如下：
# 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)
下面的例子，在一個數(shù)組來獲取所有組件按以下格式：
[sec,min,hour,day,month,year,wday,yday,isdst,zone]
嘗試以下操作：
#!/usr/bin/ruby -w
time = Time.new
values = time.to_a
p values
這將產(chǎn)生以下結(jié)果：
[26, 10, 12, 2, 6, 2008, 1, 154, false, "MST"]
這個數(shù)組可以傳遞給Time.utc或Time.local函數(shù)得到不同的日期格式如下：
#!/usr/bin/ruby -w
time = Time.new
values = time.to_a
puts Time.utc(*values)
這將產(chǎn)生以下結(jié)果：
Mon Jun 02 12:15:36 UTC 2008
跟隨著的方式來獲得內(nèi)部表示（依賴于平臺）歷元以來的秒數(shù)時間：
# 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
時區(qū)和夏令時：
可以使用一個 Time 對象來獲取相關(guān)的所有信息的時區(qū)和夏令如下：
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
格式化時間和日期：
有各種各樣的方式來格式化日期和時間。下面是一個例子，說明幾個：
#!/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")
這將產(chǎn)生以下結(jié)果：
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
時間算術(shù)：
可以在時間上做簡單的算術(shù)如下：
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
這將產(chǎn)生以下結(jié)果：
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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