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Hey I'm back.



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Yeah I forgot something that is kind of important to teach you guys that I said I was going to if you



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remember when we were going through our our message cell we talked about the time stamp and that I was



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going to get back to it.



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And then I forgot to.



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So yeah we're going to go over that right now.



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So strap in we're going to talk about some ISO 86 or one dates.



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All right.



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So the format that the server gives the spec for dates is in the format called ISO 6 or 1.



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And so it's an international standard you can do some googling on it.



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But basically this is how it comes back.



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We have.



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I mean it's kind of recognizable.



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Here's your standard year month and day.



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Then we get into the hours minutes seconds and milliseconds.



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So this wouldn't be so bad to work with because Apple actually has a built in I assume 86 or one date



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for matter but the problem is the builtin one doesn't play well with milliseconds.



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So if we had just been given this right here then it be no problem we'd be able to convert this string



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into an ISO 86 or 1 date and then convert that directly to a date format that we're that we want to



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use.



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But because we have the Millicent's on here we're going to have to do a little bit of niggling with



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the string chopping off the end and then reopening the Z.



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So you know that's that's just just what we got to do so let's do it.



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First thing we're doing we're going to unwrap our our data I'm going to say guard let ISO date equal



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the message that time Stamm else we're going to return and then we're going to say we're going to do



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is we want to turn this string into this string.



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So we want to chop off these last five parts of the parts of the string OK.



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So we're going to we're going to define we're going to use a function called substring to and basically



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saying it'll take a string up to a specified index.



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So we need to tell it where to stop.



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So we're going to do that by saying that and equal ISO date dot index and to pick this one right here



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which returns it indicates that a specified distance from the given index.



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So the we're going to start at the end so I'm going to say I so take dot and index so we're saying start



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here and then offset by 5 which in the Bakra start can sum minus 5.



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So start at the end and then backtrack 5.



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And now this right here is your index.



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All right and then we're going to say ISO date is equal to ISO date dot substring up to and the end.



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So now this guy is this right here.



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We got rid of those last five by using substring to end.



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All right.



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So now we have a ISO 86 or one date format that is compatible with Apple's builtin formatter.



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So now we can say let ISO four matter equal I guess.



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Oh 86 so on do it formatter.



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And we're going to change our string into an ISO 86 or one date and say let chapt date equal to ISO



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formatter that date from string and the string is ISO date.



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But we also need we have to have that Z on the ends and C ISO date dot appending a string and that string



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is just the letter Z.



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OK.



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So basically through all of this we've turned this string into that string.



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And that is something that we can use with this formatter.



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So now we have an ISO 86 of one date not a string but an actual date.



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And we can use another date formatted to turn that into something more readable for us.



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OK so I say let.



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New format for equal date formatter and I can say new form letter that date format.



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And now we can customize how we want our dates to look.



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And so what we're going to do is we're going to say m m m.



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So this is going to give us the abbreviated month format.



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I'm going to say for the day that we're going to get us the hour the minute and then the AM or PM.



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All right.



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So that's our that's what our formatters is going to spit us out.



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So now we're going to say if let a final date is equal to chapt date which is an optional just because



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of how the ISO formatter works then we're going to say let a final date equal new formatted dot string



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from date.



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So now we're getting her we're already converting from a date to a string.



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OK.



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And the date is final date.



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And then we can actually set our time stamp label in our cell to this new labels that say time stamp



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label.



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That text is equal to final.



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That you're going to save that.



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And let's see here what do we got going on here.



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This needs to be of our students.



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This needs to be of bar right here guard bar.



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There we go.



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Let's get rid of this comment and let's try to run on this.



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All right.



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OK.



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Two forty nine 256 15 looks like it is a work and it's work you



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1:53 a.m..



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That's right.



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I'm still recording and editing videos at 2:00 a.m. for you guys.



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All right.



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Anyway so this is our final feature actually now so I won't forget you I told you I was going to teach



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you how to do this so I am.



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So now I guess this is the conclusion to the chat app so you guys have had fun and I'll see you around



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Johnny B sign in now.