Created
February 2, 2018 03:51
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Extension that helps to find the week's previous/next weekday. e.g. if it's sunday, what was last monday's date?
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/** | |
Extension that helps to find the week's previous/next weekday. | |
e.g. if it's sunday, what was last monday's date? | |
usage: Date().get(direction: .previous, dayName: .monday, considerToday: true) | |
*/ | |
extension Date { | |
// weekday is in form 1...7 | |
enum WeekDay: Int { | |
case sunday = 1, monday, tuesday, wednesday, thursday, friday, saturday | |
} | |
enum SearchDirection { | |
case next | |
case previous | |
var calendarOptions: NSCalendar.Options { | |
switch self { | |
case .next: | |
return .matchNextTime | |
case .previous: | |
return [.searchBackwards, .matchNextTime] | |
} | |
} | |
} | |
func get(direction: SearchDirection, dayName: WeekDay, considerToday consider: Bool = false) -> Date { | |
let nextWeekDayIndex = dayName.rawValue | |
let today = self | |
let calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)! | |
if consider && calendar.component(.weekday, from: today as Date) == nextWeekDayIndex { | |
return today | |
} | |
var nextDateComponent = DateComponents() | |
nextDateComponent.weekday = nextWeekDayIndex | |
let date = calendar.nextDate(after: today, matching: nextDateComponent, options: direction.calendarOptions)! | |
return date | |
} | |
} |
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