A playground to get easy helpers for dates

TimeHelper.swift

//: Playground - noun: a place where people can play

import Foundation

extension DateComponents {
    static prefix func - (components: DateComponents) -> DateComponents {
        var newComponents = DateComponents()
        newComponents.calendar = components.calendar
        newComponents.timeZone = components.timeZone
        
        if let year = components.year {
            newComponents.year = -year
        }
        if let month = components.month {
            newComponents.month = -month
        }
        if let day = components.day {
            newComponents.day = -day
        }
        if let hour = components.hour {
            newComponents.hour = -hour
        }
        if let minute = components.minute {
            newComponents.minute = -minute
        }
        if let second = components.second {
            newComponents.second = -second
        }
        if let nanosecond = components.nanosecond {
            newComponents.nanosecond = -nanosecond
        }
        
        return newComponents
    }
    
    var ago: Date? {
        let calendar = self.calendar ?? Calendar(identifier: .gregorian)
        return calendar.date(byAdding: -self, to: Date())
    }
    
    var fromNow: Date? {
        let calendar = self.calendar ?? Calendar(identifier: .gregorian)
        return calendar.date(byAdding: self, to: Date())
    }
}

extension Int {
    var days: DateComponents {
        var component = DateComponents()
        component.day = self
        return component
    }
    var day: DateComponents { return days }
    
    var weeks: DateComponents {
        var component = DateComponents()
        component.day = self * 7
        return component
    }
    var week: DateComponents { return weeks }
    
    var months: DateComponents {
        var component = DateComponents()
        component.month = self
        return component
    }
    var month: DateComponents { return months }
    
    var seconds: DateComponents {
        var component = DateComponents()
        component.second = self
        return component
    }
    var second: DateComponents { return seconds }
    
    var minutes: DateComponents {
        var component = DateComponents()
        component.minute = self
        return component
    }
    var minute: DateComponents { return minutes }
    
    var hours: DateComponents {
        var component = DateComponents()
        component.hour = self
        return component
    }
    var hour: DateComponents { return hours }
    
    var years: DateComponents {
        var component = DateComponents()
        component.year = self
        return component
    }
    var year: DateComponents { return years }
}

Date()
1.day.ago
3.days.ago
5.days.fromNow

1.month.ago

1.year.ago
3.years.ago
4.years.fromNow