如何使用Moment.js格式化ISO日期BC?
How to format ISO dates BC with Moment.js?
moment("-700-01-01").year(); // 700 (WRONG) moment("-0700-01-01").year(); // 700 (WRONG) moment("-000700-01-01").year(); // -700 (RIGHT)出于某种原因,使用6位数的年份表示法是可行的.这是正确"的方式吗?为什么像"-700-01-01"这样的符号不起作用?
For some reason a year notation with 6 digits works. Is that the "right" way? Why doesn't notation like "-700-01-01" work?
推荐答案这不是Moment.js特有的问题;如果您还尝试使用所使用的字符串初始化Date()对象,也会发生相同的情况.如果首先将其创建为Date()对象,然后使用setYear()手动分配年份,则它确实会接受-700的日期:
This isn't a Moment.js-specific problem; the same happens if you attempt to initialise a Date() object with the string you're using as well. If you create it as a Date() object first and manually assign the year using setYear() it does accept a date of -700:
var date = new Date(); date.setYear(-700); moment(date).year();> -700
但是尼尔斯·库伦杰斯(Niels Keurentjes)指出,很久以前的日期计算变得非常复杂,可能根本不可靠.
However as Niels Keurentjes has pointed out, date calculations this far back get quite complicated and may not be at all reliable.
如果要"-700-01-01",则可以分别配置年,月和日:
If you want "-700-01-01" you can configure the year, month and day separately:
date.setYear(-700); date.setMonth(0); date.setDate(1); console.log(date);> Fri Jan 01 -700 11:53:57 GMT+0000 (GMT Standard Time)
关于公元前700年第一个月的第一天实际上是否是星期五……您必须亲自检查一下.
As to whether the 1st day of the 1st month in 700BC was actually a Friday... you'll have to look that one up yourself.
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