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Swift で月の最初の日を得る

Xcode
NSDate
Swift
NSCalen

Last updated at 2015-08-30Posted at 2015-08-30

メモ

NSDate, NSCalendar, NSCalendarComponents を使って月の最初の日を得る

var date = NSDate()
var calendar = NSCalendar.currentCalendar()
var comps = calendar.components(NSCalendarUnit.CalendarUnitDay, fromDate: date)
comps.day = comps.day - comps.day - comps.day + 1
let firstDay = calendar.dateByAddingComponents(comps, toDate: NSDate(), options: nil)
println(firstDay)

出力結果
Optional(2015-08-01 10:34:05 +0000)

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