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[英]Getting date from DateFormatter without delimiter(/ or -) returns wrong date:
[英]Getting wrong output from DateFormatter
我上周從代碼下面開始,星期六開始。 它正在獲取日期(2019-04-27 18:30:00 +0000,019-05-04 18:30:00 +0000),但是當我嘗試設置DateFormatter它正在獲取日期(28-04-2019 00:00) :00,05-05-2019 00:00:00)。 我希望星期一在印度當地時間和日期開始一周的開始。
var dateFormatter:DateFormatter!
var date:Date!
dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy HH:mm:ss"
date = Date()
var calendar = Calendar.current
calendar.firstWeekday = 2 // 1 is Sunday, 2 is Monday
let lastWeek = calendar.date(byAdding: .weekOfYear, value: -1, to: Date())
if let lastWeek = lastWeek {
var startOfLastWeek = Date()
var interval = TimeInterval(0)
_ = Calendar.current.dateInterval(of: .weekOfYear, start: &startOfLastWeek, interval: &interval, for: lastWeek)
let endOfLastWeek = startOfLastWeek.addingTimeInterval(interval)
print(startOfLastWeek)//2019-04-27 18:30:00 +0000
print(endOfLastWeek)//019-05-04 18:30:00 +0000
let startWeekString = dateFormatter.string(from: startOfLastWeek)
let endWeekString = dateFormatter.string(from: endOfLastWeek)
print(startWeekString)//28-04-2019 00:00:00
print(endWeekString)//05-05-2019 00:00:00
任何編程語言中的Date
始終為UTC,它沒有時區。 DateFormatter
用於通過提供時區以本地/本地化格式顯示Date
。
Date Formatter
允許您將其轉換為人類可讀的字符串。 在手機中:
不要試圖過度使用它。
使用下面的代碼查找上周一和周日:
var date:Date!
dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy HH:mm:ss"
dateFormatter.timeZone=TimeZone.current
TimeZone.current
date = Date()
var calendar = Calendar.current
calendar.firstWeekday = 2 // 1 is Sunday, 2 is Monday
let lastWeek = calendar.date(byAdding: .weekOfYear, value: -1, to: Date())
if let lastWeek = lastWeek {
var startOfLastWeek = Date()
var interval = TimeInterval(0)
_ = Calendar.current.dateInterval(of: .weekOfYear, start: &startOfLastWeek, interval: &interval, for: lastWeek)
startOfLastWeek = calendar.date(byAdding: .weekday, value: 1, to: startOfLastWeek)!
print(interval)
interval = interval - 1
let endOfLastWeek = startOfLastWeek.addingTimeInterval(interval)
print(startOfLastWeek)//2019-04-27 18:30:00 +0000
print(endOfLastWeek)//019-05-04 18:30:00 +0000
let startWeekString = dateFormatter.string(from: startOfLastWeek)
let endWeekString = dateFormatter.string(from: endOfLastWeek)
print(startWeekString)//28-04-2019 00:00:00
print(endWeekString)//05-05-2019 00:00:00
}
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