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Date Extension
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| - (NSComparisonResult)compareDatesWith:(NSDate*)otherDate { | |
| NSCalendar* calendar = [NSCalendar currentCalendar]; | |
| unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay; | |
| NSDateComponents* comp1 = [calendar components:unitFlags fromDate:self]; | |
| NSDateComponents* comp2 = [calendar components:unitFlags fromDate:otherDate]; | |
| NSInteger comparison = [comp1 year] * 10000 + [comp1 month] * 100 + [comp1 day] - | |
| ([comp2 year] * 10000 + [comp2 month] * 100 + [comp2 day]); | |
| return comparison > 0 ? NSOrderedDescending : comparison < 0 ? NSOrderedAscending : NSOrderedSame; | |
| } |
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| extension Date { | |
| func toString(format: String) -> String { | |
| let formatter = DateFormatter() | |
| formatter.dateFormat = format | |
| return formatter.string(from: self) | |
| } | |
| var isToday: Bool { | |
| return compareDate(Date()) == .orderedSame | |
| } | |
| var isYesterday: Bool { | |
| let yesterday = Date().addDay(-1) | |
| return compareDate(yesterday) == .orderedSame | |
| } | |
| var toUserFriendlyFormat: String { | |
| switch self { | |
| case let date where date.isToday: | |
| return "Today" | |
| case let date where date.isYesterday: | |
| return "Yesterday" | |
| default: | |
| return self.toString(format: "dd MMMM") | |
| } | |
| } | |
| private func addDay(_ diff: Int) -> Date { | |
| let calendar = Calendar.current | |
| return calendar.date(byAdding: .day, value: diff, to: self)! | |
| } | |
| private func compareDate(_ other: Date) -> ComparisonResult { | |
| let calendar = Calendar.current | |
| let components: [Calendar.Component] = [.year, .month, .day] | |
| let lhs = calendar.dateComponents(Set(components), from: self) | |
| let rhs = calendar.dateComponents(Set(components), from: other) | |
| let diff = (lhs.year! - rhs.year!) * 10000 + (lhs.month! - rhs.month!) * 100 + lhs.day! - rhs.day! | |
| return diff > 0 ? .orderedAscending : diff == 0 ? .orderedSame : .orderedDescending | |
| } | |
| } |
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