红宝石 |日期时间 to_date()函数

DateTime#to_date() : to_date()是一个 DateTime 类方法，它返回表示自身的 Date 对象。

Syntax: DateTime.to_date()

Parameter: DateTime values

Return: the Date object which denotes itself.

示例 #1：

# Ruby code for DateTime.to_date() 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))
  
  
#  to_date method
puts "DateTime to_date form : #{date_a.to_date}\n\n"
  
puts "DateTime to_date form : #{date_b.to_date}\n\n"
  
puts "DateTime to_date form : #{date_c.to_date}\n\n"

输出 ：

DateTime to_date form : 2019-08-10

DateTime to_date form : 2019-08-10

DateTime to_date form : 2019-08-10

示例 #2：

# Ruby code for DateTime.to_date() 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')
  
  
#  to_date method
puts "DateTime to_date form : #{date_a.to_date}\n\n"
  
puts "DateTime to_date form : #{date_b.to_date}\n\n"
  
puts "DateTime to_date form : #{date_c.to_date}\n\n"

输出 ：

DateTime to_date form : 2019-08-10

DateTime to_date form : 2018-08-10

DateTime to_date form : 2019-08-10