Get NSDate Object N seconds from current date

suggest change

The number of seconds from the current date and time for the new date. Use a negative value to specify a date before the current date.

For doing this we have a method named dateWithTimerIntervalSinceNow(seconds: NSTimeInterval) -> NSDate (Swift) or + (NSDate*)dateWithTimeIntervalSinceNow:(NSTimeInterval)seconds (Objective-C).

Now for example, if you require a date one week from current date and one week to current date, then we can do it as.

Swift

let totalSecondsInWeek:NSTimeInterval = 7 * 24 * 60 * 60;
//Using negative value for previous date from today
let nextWeek = NSDate().dateWithTimerIntervalSinceNow(totalSecondsInWeek)

//Using positive value for future date from today
let lastWeek = NSDate().dateWithTimerIntervalSinceNow(-totalSecondsInWeek)

Swift 3

let totalSecondsInWeek:TimeInterval = 7 * 24 * 60 * 60;

//Using positive value to add to the current date
let nextWeek = Date(timeIntervalSinceNow: totalSecondsInWeek)

//Using negative value to get date one week from current date
let lastWeek = Date(timeIntervalSinceNow: -totalSecondsInWeek)

Objective-C

NSTimeInterval totalSecondsInWeek = 7 * 24 * 60 * 60;
//Using negative value for previous date from today
NSDate *lastWeek = [NSDate dateWithTimeIntervalSinceNow:-totalSecondsInWeek];

//Using positive value for future date from today
NSDate *nextWeek = [NSDate dateWithTimeIntervalSinceNow:totalSecondsInWeek];

NSLog(@"Last Week: %@", lastWeek);
NSLog(@"Right Now: %@", now);
NSLog(@"Next Week: %@", nextWeek);

Found a mistake? Have a question or improvement idea? Let me know.

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