1. 基础
time = Time.new
time = Time.now
time.year # => Year of the date
time.month # => Month of the date (1 to 12)
time.day # =>Day of the date (1 to 31)
time.wday # => Day of week: (0 to 6) 0 is Sunday
time.yday # => (0 to 365) Day of year
time.hour # => (0 to 23)
2. 格式化产生时间
time = Time.new(2008, 7, 8) # 2008-07-08 00:00:00 +0800
time = Time.local(2008, 7, 8) # 2008-07-08 00:00:00 +0800
time = Time.local(2008, 7, 8, 9, 10) # 2008-07-08 09:10:00 +0800
time = Time.utc(2008, 7, 8) #2008-07-08 00:00:00 UTC
time = Time.gm(2008, 7, 8)
3.格式转化
#转化为数组
time_arr = time.to_a
#[sec,min,hour,day,month,year,wday,yday,isdst,zone]
#这个数组可以传给Time.utc或者Time.local函数
v = Time.utc(*time_arr)
#格式化
time.to_s
time.ctime
time.localtime
time.strftime("%Y-%m-%d %H:%M:%S")
now = Time.now
past = now - 10 #10 seconds ago
#下面的在rails中可以使用
#past = now.to_date - 10.months
4. rails 中对时间的扩展
class Integer
def months
ActiveSupport::Duration.new(self * 30.days, [[:months, self]])
end
alias :month :months
def years
ActiveSupport::Duration.new(self * 365.25.days, [[:years, self]])
end
alias :year :years
end
字符串转化为时间
DateTime.parse('20120514144424').strftime('%Y-%m-%d %H:%M:%S')
"20120514144424".to_time.strftime('%Y-%m-%d %H:%M:%S')
"20120514144424".to_datetime.strftime('%Y-%m-%d %H:%M:%S')
