How to check valid Date() in Swift

Question

How to check if the date is valid, before making a SQL query using

request.predicate = NSPredicate (format: "% @ <= AND myDate% @> = myDate" startDate, endDate)

an error occurs with the leap years, like 30 of February 2016.

// code form comment...
let startDate:NSDate = dateFormatter.dateFromString("2016-10-01")!
let endDate:NSDate = dateFormatter.dateFromString("2016-10-29")!

The 30th Feb NEVER exists. Even on a leap year Feb only goes up to 29th. As far as CoreFoundation is concerned, using the date of the 30th Feb is no different to using the date 192nd April. — Jacob King, Oct 26 '16 at 12:06
let startDate:NSDate = dateFormatter.dateFromString("2016-10-01")! let endDate:NSDate = dateFormatter.dateFromString("2016-10-29")! — AndreLuisRomero, Oct 26 '16 at 12:11
https://stackoverflow.com/questions/33605816/first-and-last-day-of-the-current-month-in-swift — AndreLuisRomero, Sep 13 '17 at 13:37

sketchyTech · Answer 1 · 2019-04-08T15:06:18.610

The return value of a date generated by DateFormatter's date(from:) method is an optional. If nil is returned the date is invalid, otherwise it's valid.

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"

if let date = dateFormatter.date(from:"2016-02-30") {
    print(date) // if this prints date is valid
}
else {
    print("Date is Invalid") // if this prints date is invalid
}

A Date cannot be instantiated with an invalid date string that is outside of the realm of real calendar dates.

If what you are asking is whether a date falls between two other dates, see here: https://stackoverflow.com/a/40057117/1694526

score 0 · Answer 2 · answered Oct 26 '16 at 13:44

0

Use DateFormatter class... It can be used to check any string whether it is a valid date or not and accordingly the string can be converted into nsdata.

answered Oct 26 '16 at 13:44

Vedant Mahant

149
6

How to check valid Date() in Swift

2 Answers2