Question

我希望用户能够进入日期。采用一种形式,并在这种背景下将这种形式改为天数。之后又放下了几天时间,然后将该日期改为日期。

例:

出生日期。

- 折合日数(日期)

然后,将新的总数改为:

新总数改为日期。

Can anyone point me in the right direction of doing this, or do they know some function for doing this?

So lets say :user enters date 13th July 1980 We use js to convert this to total number of days 11,453 days

Then create new function : subtotal=11453-280

并将这些天数改为日期,并在屏幕上重复。

Answer 1

var d1 = Date.parse("13 July 1980");
d1 = d1 - 24192000000; // 280 days in milliseconds

var newDate = new Date(d1);

console.log(newDate); // will return a date object that represents Oct 07 1979

Then use the following link to format it: http://www.webdevelopersnotes.com/tips/html/10_ways_to_format_time_and_date_using_javascript.php3

Thanks to this SO question for the link: Where can I find documentation on formatting a date in JavaScript?

Answer 2

日期用途物体。利用工厂进行转换。因此,如果你拿到日mill,然后拖拉或增加日子 * 86400 * 1 000,然后制造另一日期标。

var d2 = new Date (d1.getTime() - days_to_subtract * 86400 * 1000);

This might help... http://www.w3schools.com/jsref/jsref_obj_date.asp

Answer 3

Why the conversion to and from days? To add or subtract days, just add or subtract them from the date:

// New date object for 15 November, 2011
var d = new Date(2011, 10, 15);

// Add 5 days
d.setDate(d.getDate() + 5);  // 20-Nov-2011

// Subract 200 days
d.setDate(d.getDate() - 200); // 4-May-2011

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