Why I can't convert string to date in Swift? [duplicate]

问题

This question already has an answer here:

dateFromString returns nil for some values (1 answer)

Closed 2 years ago.

I have this simple code:

let string = "2017-02-23 15:26:00";
let df = DateFormatter();
df.dateFormat = "yyyy-MM-dd hh:mm:ss";
let result = df.date(from: string);

The result is nil. Why?

回答1:

Your date is 24 hour format So it should be HH not hh, so change your date formate to yyyy-MM-dd HH:mm:ss.

let string = "2017-02-23 15:26:00"
let df = DateFormatter()
df.dateFormat = "yyyy-MM-dd HH:mm:ss"
let result = df.date(from: string)

回答2:

let string = "2017-02-23 15:26:00";
let df = DateFormatter();
df.dateFormat = "yyyy-MM-dd HH:mm:ss";
let result = df.date(from: string);

来源：https://stackoverflow.com/questions/42502568/why-i-cant-convert-string-to-date-in-swift