Swift NSDate startOfDay是凌晨4点?
我试图在给定的24小时内每10分钟写一个循环,从午夜开始,到午夜前10分钟结束。所以我试过这个Swift NSDate startOfDay是凌晨4点?,swift,nscalendar,Swift,Nscalendar,我试图在给定的24小时内每10分钟写一个循环,从午夜开始,到午夜前10分钟结束。所以我试过这个 let x = Calendar.current.component(.year, from: Date()) let dateFormatter = DateFormatter() dateFormatter.dateFormat="dd-MM-yyyy" let june = dateFormatter.date(from: "21-06-" + String(x)
let x = Calendar.current.component(.year, from: Date())
let dateFormatter = DateFormatter()
dateFormatter.dateFormat="dd-MM-yyyy"
let june = dateFormatter.date(from: "21-06-" + String(x))
6月的结果为“2017-06-21 04:00:00 UTC”。从技术上讲,这是正确的,我的本地日是UTZ的凌晨4点,但我传递到的代码,来自天文年鉴,已经处理了本地/全局转换
于是我尝试了这个:
var UTZCal = Calendar.current
UTZCal.timeZone = TimeZone(abbreviation: "GMT")!
let x = UTZCal.component(.year, from: Date())
let dateFormatter = DateFormatter()
dateFormatter.dateFormat="dd-MM-yyyy"
dateFormatter.calendar = UTZCal
let june = dateFormatter.date(from: "21-06-" + String(x))
这产生了完全相同的结果。我遗漏了什么?日期格式化程序似乎没有使用
分配的日历,并添加
dateFormatter.timeZone = UTZCal.timeZone
对您的代码进行修改,使其产生预期的结果。但请注意,您
可以将计算简化为
var utzCal = Calendar(identifier: .gregorian)
utzCal.timeZone = TimeZone(secondsFromGMT: 0)!
let year = utzCal.component(.year, from: Date())
let june = DateComponents(calendar: utzCal, year: year, month: 6, day: 21).date!
print(june) // 2017-06-21 00:00:00 +0000
似乎日期格式化程序没有使用
分配的日历,并添加
dateFormatter.timeZone = UTZCal.timeZone
对您的代码进行修改,使其产生预期的结果。但请注意,您
可以将计算简化为
var utzCal = Calendar(identifier: .gregorian)
utzCal.timeZone = TimeZone(secondsFromGMT: 0)!
let year = utzCal.component(.year, from: Date())
let june = DateComponents(calendar: utzCal, year: year, month: 6, day: 21).date!
print(june) // 2017-06-21 00:00:00 +0000