ruby 格式化当前日期时间

ruby 用Time类获取当前时间。

t = Time.new

puts t

可以看到输出的是(我现在运行的时间)：

Sat Jan 29 10:45:22 +0800 2011

 

一般我们拿来用，都不会直接用这样“复杂”的时间格式。

下面通过Time的strftime方法来格式化处理，得到想到的日期格式。

1.比如你想获取 “2011-01-29” 这样的日期格式

t = Time.new

date = t.strftime("%Y-%m-%d")

puts date    #2011-01-29

 

2.比如你想获取“2011年01月29日 星期六 10:50 AM” 这样的格式

dayOfWeek = [ "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" ]

t = Time.new

puts t

date = t.strftime("%Y年%m月%d日 ") << dayOfWeek[t.strftime("%w").to_i] << t.strftime(" %H:%M %p")

puts date    #2011年01月29日 星期六 10:50 AM

 

参数：

%a - The abbreviated weekday name (``Sun'')

%A - The full weekday name (``Sunday'')

%b - The abbreviated month name (``Jan'')

%B - The full month name (``January'')

%c - The preferred local date and time representation

%d - Day of the month (01..31)

%H - Hour of the day, 24-hour clock (00..23)

%I - Hour of the day, 12-hour clock (01..12)

%j - Day of the year (001..366)

%m - Month of the year (01..12)

%M - Minute of the hour (00..59)

%p - Meridian indicator (``AM'' or ``PM'')

%S - Second of the minute (00..60)

%U - Week number of the current year, starting with the first Sunday as the first day of the first week (00..53)

%W - Week number of the current year, starting with the first Monday as the first day of the first week (00..53)

%w - Day of the week (Sunday is 0, 0..6)

%x - Preferred representation for the date alone, no time

%X - Preferred representation for the time alone, no date

%y - Year without a century (00..99)

%Y - Year with century

%Z - Time zone name

%% - Literal ``%'' character