在 JavaScript 中添加一周到日期：舍入误差还是夏令时？
我试图向数据对象添加 7 天，但是在某个阶段我开始得到奇怪的结果。
var currDate = new Date(2011, 2, 28)
, oldTicks = currDate.getTime()
, newTicks = oldTicks + (86400000 * 7)
, nextWeek = new Date(newTicks)
console.log('Old ticks: ' + oldTicks)
console.log('New ticks: ' + newTicks)
console.log('New date : ' + nextWeek)
我得到的输出，Chrome/FF 都是：
Old ticks: 1301230800000
New ticks: 1301835600000
log: New date : Sun Apr 03 2011 23:00:00 GMT+1000 (EST)
预期得到：
log: New date : Mon Apr 04 2011 23:00:00 GMT+1000 (EST)
如您所见，不是添加 7 天，而是只添加了 6 天。不过，上面的代码适用于其他日期，例如 2011 年 4 月 28 日或 2011 年 5 月 28 日。
I am trying to add seven days to a Data object, however at some stage I start getting strange results.
var currDate = new Date(2011, 2, 28)
, oldTicks = currDate.getTime()
, newTicks = oldTicks + (86400000 * 7)
, nextWeek = new Date(newTicks)
console.log('Old ticks: ' + oldTicks)
console.log('New ticks: ' + newTicks)
console.log('New date : ' + nextWeek)
The output I get, both Chrome/FF is:
Old ticks: 1301230800000
New ticks: 1301835600000
log: New date : Sun Apr 03 2011 23:00:00 GMT+1000 (EST)
Expected to get:
log: New date : Mon Apr 04 2011 23:00:00 GMT+1000 (EST)
As you can see, instead of adding 7 days, just 6 were added. The code above, however, works fine with other dates, say 2011 Apr 28 or 2011 May 28.
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根据我的推断，Crescent Fresh 是正确的。
查找时区
GMT+1000 (EST)看起来像澳大利亚东部标准时间 - 来自 wikipedia - 按 UTC 偏移量列出的时区列表以及来自 wikipedia - 世界各地的日列表节约时间，显示澳大利亚在 OP 指定的日期范围之间从标准时间切换到夏令时。
Crescent Fresh is correct form what I can deduce.
Looking up timezones
GMT+1000 (EST)looks like Australia Eastern Standard Time - from wikipedia - list of timezones by UTC offsetAnd from wikipedia - daylist savings time around the world, shows that Australia switches from standard to daylight savings time in between the date ranges specified by the OP.
如果是我，我会这样做：
对一天中的时间进行一些可能的调整。
也就是说，当我在 Chrome 开发者控制台中尝试您的代码时，我得到的答案是 4 月 4 日。
If it were me I'd do:
with some possible adjustments for time of day.
That said, when I try your code in my Chrome developer console, I get 04 Apr as the answer.