Ruby DateTime strftime()函数

DateTime#strftime() : strftime()是DateTime类的一个方法，它返回Formats日期到给定格式字符串中的指令。

语法。DateTime.strftime()

参数。DateTime值

返回：根据给定的格式字符串中的指令生成的日期。

例子 #1 :

# Ruby code for DateTime.strftime() method
  
# loading library
require 'date'
  
# declaring DateTime value
date_a = DateTime.new(2019, 8, 10, 4, 10, 9)
  
# declaring DateTime value
date_b = DateTime.new(2019, 8, 10.5)
  
# declaring DateTime value
date_c = DateTime.new(2019, 8, 10, 4, 10, 9, Rational(4, 24))
  
  
#  strftime method
puts "DateTime strftime form : #{date_a.strftime("Printed on %m/%d/%Y")}\n\n"
  
puts "DateTime strftime form : #{date_b.strftime}\n\n"
  
puts "DateTime strftime form : #{date_c.strftime("at %I:%M%p")}\n\n"

输出:

DateTime strftime form : Printed on 08/10/2019

DateTime strftime form : 2019-08-10T12:00:00+00:00

DateTime strftime form : at 04:10AM

例子 #2 :

# Ruby code for DateTime.strftime() method
  
# loading library
require 'date'
  
# declaring DateTime value
date_a = DateTime.new(2019, 8, 10, 5)
  
# declaring DateTime value
date_b = DateTime.parse('10 Aug 2018 04:10:06+04:30')
  
# declaring DateTime value
date_c = DateTime.new(2019, 8, 10, 4, 10, 9, '+03:00')
  
  
#  strftime method
puts "DateTime strftime form : #{date_a.strftime("Printed on %m/%d/%Y")}\n\n"
  
puts "DateTime strftime form : #{date_b.strftime}\n\n"
  
puts "DateTime strftime form : #{date_c.strftime("at %I:%M%p")}\n\n"

输出:

DateTime strftime form : Printed on 08/10/2019

DateTime strftime form : 2018-08-10T04:10:06+04:30

DateTime strftime form : at 04:10AM