红宝石 |日期时间 strftime()函数

DateTime#strftime() ：strftime()是一个 DateTime 类方法，它以给定的格式字符串将格式日期返回给指令。

Syntax: DateTime.strftime()

Parameter: DateTime values

Return: ate according to the directives in the given format string.

示例 #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

示例 #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