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输出周几
Wednesday

时间标记_随机数
1529519435
1529519435_33702

输出周几、日、月、年,时间,上午或下午
Wednesday 20th of June 2018 06:30:35 PM

输出 October 3, 1975 was on 周几
Oct 3, 1975 was on a Friday

在 format 参数中使用常量
Wed, 20 Jun 18 18:30:35 +0000

输出类似:1975-10-03T00:00:00+00:00
1975-10-03T00:00:00+00:00