CODEWITHSUNDEEP
swiftdatedateformatter
jorge_mr
jorge_mr

Reputation: 11

swift - how to convert date from am/pm to 24 hour format

Here is the thing. I have my iPhone in am/pm format and iPhone Language in Spanish(MX). when I ask for the date, I get something like 2018-03-21 5:14:59 a. m. +0000 and it's a date type, then I try to convert it to string in 24hours format, and I get something like 2018-03-20 23:14:59 and it's a String type, BUT when I try to convert that string into date, I get the same date in am/pm format again 2018-03-21 5:14:59 a. m. +0000 I don't know what else to do, all I want is convert my am/pm date to 24hours date NOT STRING. Help me please. Here is my code in Swift 4

    let todayDate = Date()
    print("todayDate: \(todayDate)")
    let dateFormatter = DateFormatter()
    dateFormatter.locale = Locale(identifier: "en_US_POSIX")
    dateFormatter.dateFormat = "yyyy-MM-dd' 'HH:mm:ss"
    let stringDate = dateFormatter.string(from: todayDate)
    print("stringDate: \(stringDate)")
    let dateFromString = dateFormatter.date(from: stringDate)
    print("dateFromString: \(dateFromString!)\n\n\n")

this is my console results 

    todayDate: 2018-03-21 5:14:59 a. m. +0000
    stringDate: 2018-03-20 23:14:59
    dateFromString: 2018-03-21 5:14:59 a. m. +0000

Upvotes: 0

Views: 1555

Answers (1)

MadProgrammer
MadProgrammer

Reputation: 347214

all I want is convert my am/pm date to 24hours date NOT STRING

That's not how Date works.

From the Documentation

Date values represent a time interval relative to an absolute reference date.

Date is simply a container for the period of time since the reference date, it does not carry any kind of formatting information itself.

let dateFromString = dateFormatter.date(from: stringDate)
print("dateFromString: \(dateFromString!)\n\n\n")

is simply converting the stringDate (2018-03-20 23:14:59 in your example) back to Date object and print is using the Dates description implementation to provide you with information about it's current value

So, if we instead added...

print("dateFromString: \(dateFormatter.string(from: dateFromString!))\n\n\n")

It would print 2018-03-21 16:44:17

Your best bet is not to care. Simply carry the value around in a Date object and format it to String when you need to display it to the user or otherwise need it formatted - that's the point of having formatters

Upvotes: 4

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