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in this lecture we are going to see how to deal with dates in Jason we have already seen different data types in Jason such as strings numbers boolean objects etc but you might have noticed that we haven't discussed about dates as a data type it is because that Jason does not support date as a data type in real-world scenarios we will have to use dates in many different situations so let's see how we can use dates in Jason so if you get some real-world JSON data and if it includes a date information the API documentation will clearly specify which key is representing date information let us see how we can deal with dates in Jason using some simple examples so I have created a very basic HTML page and I have added the title like deal with date in JSON so to show the result let me add a development with ID result okay and within the head section let me add a script but I'm going to write our JavaScript code so for the window onload let me write the function equals function this is an anonymous function and let me write the code here so what I am going to do here is that I am expecting some JSON string so where JSON string to make it simple I myself write the JSON string so it should be within single quotes as it is a string value jason is a string value not an object so within curly braces let me specify f name as John okay then put a comma as I am separating key value pairs okay then I am specifying L name and it is specified as Smith and suppose we also have another key named D OB which represents date of birth that is date of birth of this person so in most of the cases when you get some JSON string and if it contains some date information the date will be represented either as a number or as a string so the number will be actually the number of milliseconds since January 1st 1970 so JavaScript also uses this format that is date as a number where the number will be the time in milliseconds since January 1st 1970 so if the date of birth of this person is 22nd November 1982 then the number will be 46 77 1 2 1 2 3 4 5 zeros I don't have to do any calculation to find this you can use a uniques time stamp converter which is available online and if you just enter the date of birth or the date you want in the specific format it will convert it into this format if you want I can show you that let me enter Google and if I type UNIX timestamp converter you will get a number of timestamp converters ok and if I click this one and suppose I enter 1982 then month 11 I'm just entering some value ok 2200 convert I'm getting 46 77 1 2 0 0 but if you see this value is actually in seconds we want to have it in milliseconds so this value should be multiplied by thousand that is why I have entered here 46 77 1 2 0 0 that is up to this and I have also added three more zeros because I want to get this number in milliseconds so this is the number that represents 22nd November 1982 I just assume that this is the date of birth of this person so this will be the JSON string we receive if API are the program that returns this JSON string represents date of birth in this format that is essay number next what we need to do we now have the Jason string with us so to convert this into JavaScript what we can do we can use a parse method which we have already discussed so we can specify where jeaious object equals jason dot parse I need to specify the jason string it is a JSON string itself okay so now this JS object actually contains the JavaScript object converted from this JSON string so suppose I just want to display alert jeaious object dot DOB let's see what output we will get so let me save this this is the page let me close this I have saved this page actually within my local server so here within Sam which is my local server within htdocs I have created a folder named server and I have saved our file within this bill with date dot HTML okay now let me refresh this see we are seeing 46 77 1 2 then 5 zeroes which is the value we have specified here so this is what we are getting now si do be our date of birth so next what we need to do now this is just a number we need to convert this into a date object then only it will be easy to process right so I want to save this value as the DOB now so I am specifying je s object dot do B equals I can use the date object like this new date je s object dot DOB now what will happen this J s object or DOB is now a number which will be converted to a date object and it will be saved within the jeaious objects do B key so now if we alert this let me save this what will we get let me refresh see we are getting Monday November 22 1982 5:30 G t plus zero five three zero is T this is Indian Standard Time as I live in India so this is now a date object so suppose I want to display something like John Smith was born on 22 November 1982 or whatever format we want we can use this DOB now so this DOB is actually a date object now as we have seen here this a Mayan represents the day of the week now amber or I know he represents the month 22 days 1982 year then this time as well this is GMT plus zero five three zero is Indian Standard Time which is calculated based on de universal time that is UTC so suppose I want to represent it in the way I want it will be easy if we get it as a string right so javascript provides a method called to jason which will convert the date into a string format so i want to display it in the format John Smith was born on 22/11/2011 where birthday equals let me use Jas object dot DOB which will give us a date of birth as a date object I want to convert this into a string so I am using two J's and method which is offered by JavaScript so now this is a string suppose I alert birthday say let me refresh this is represented like this and this is represented in this format this is actually iso 8601 format which is an internationally accepted format to exchange date/time values so here it is represented like why why why why mm DD then T which represents a time value follows we should specify 80 in ISO 8601 format if we want to specify the time value and this is hh:mm:ss there's a seconds and after this point zero zero zero is milliseconds and then Z represents UTC that is Universal time so this is the ISO 8601 format and to Jason actually converts our date object into a string which is represented as iso eight six zero and format so what I want now I want to represent only the date value that is 1982 11 22 in the format 22/11/2013 cero comma 10 because these are the first 10 characters let me refresh once again okay see four five six seven eight nine ten so I want to get the first 10 characters that is why I have specified zero comma 10 okay here I'm going to use a number of string methods to get the date in my preferred format okay dot let me specify split using - and then I want to reverse it using reverse method and then I want to join them using slash because I want the data in the format DD / mm / YY YY so this is the format I want okay here instead of underscore it should be closing of bracket so hope you are clear now let me show you the output now let me refresh this is the date object and now I am getting it in the format I want because 22/11/2013 string methods so first we have collected the date of birth which is a number and I have converted it into a date object using date method and I have saved it in je s objects do B key and here we are just displaying it and I want to get the birthday like DD / mm / YY YY so J s object DOB dot - Jason means what will happen this date object will be converted into a string value which is represented as an ISO 8601 format I will explain ISO 8601 format in detail here again okay now I get the value as 1982 then - 11 - 22 then T which is representing that the time value is following then the time as hh:mm:ss then fraction of second and then Z Z represents UTC or universal time then I want to get the first 10 characters that is why I have used slice 0 10 then I have split them using the - so what happens it will be an array with 3 values the values will be 1982 11 and 22 so I want to reverse the array using reverse method and again I want to join those items in the array using slash then I get it in the specified format that is the format I prefer suppose I want to have dot instead of slash what I can do here instead of slash I can just specify dot whatever format I want so let me refresh see okay 22.7 dot 1982 now what I want let me try to display before that let me remove these two alert okay so let me specify document dot get element by ID what is the ID we have specified for the development this result dot innerhtml equals I want to get Jay s object dot F name plus space plus J s object dot L name again space plus I want to enter okay we can remove this space and here we can have a space and then specify was born on then space plus birthday it is stored in the birthday variable right now let's see the output sale let me refresh see John Smith was born on 22 11 1982 so this is the format in which I wanted to display the information so here what we have seen here we expect the JSON string contains a date information which is represented as a number and that number is a number of milliseconds since January 1st 1970 so if this date of birth is not 22 11 1982 then this value will be different right so we can get that value using any uniques time stamp converter and you just need to multiply the value by thousand as the unique timestamp converter usually represents it in seconds and we want to get the value in milliseconds then we used the json dot parse method to convert it into a javascript object and we then use the date method to convert the number into a date object and later we have displayed it in the format we want using the two jason method which converts our date object into a string which is an iso 8601 format string and then we display the output so here we got the value as a number suppose we get the value as an iso 8601 string itself so suppose we expect some date which represents the date of creation for example you are subscribing to some email list and it might be having a valid date full subscription and suppose it expires on some particular date say after 30 days you are subscribed so it'll be the date of creation of the user right so here let me comment this and let me copy this paste it let the name be the same and here instead of date of birth let it be created and here it will be a string so we need to represent it within double quotes so we expect an ISO 8601 format so let me show you that format here in a new file it will be in this format why why why why then mm then B D then T then hh:mm:ss then you can have milliseconds as you want suppose it is SS then Z so let me represent some value like 1982 11 22 then T which represents a time is following let it be 11 then mm 20 then 53 dot I want to represent a fraction of a second so let it be 1 1 then Z so this is represent that like 20 seconds now 1 by 1982 and this is the time and this is universal time and instead of the Z you can also represent let me copy this you can have plus 0 5 3 0 or minus 0 5 3 0 like that also you can represent so this is the ISO 8601 format so let me copy this okay and put it within this so this will be the same date right and now we are actually getting a string value as the date which is the date created right so it is in this format already that is JS object DOB - Jason which we have done for the previous case we don't have to do it again why because it is already in the ISO 8601 format so let me comment this line okay and let me comment this as well let me copy this line and here I just want to get J s object do B which is the ISO 8601 format date and let me remove this and now try to get the output let me refresh ok we are not getting the output Y let me just try to display alert jeaious object dot DOB let me refresh this giving us undefined okay I got it it does not do B now it is created so here it is created here also it is created let me save this let me refresh see we are getting the same data okay then we are getting John Smith was born on 22 11 1982 suppose I changed this to say 1990 this to say 10 and the day to say 0 5 or 0 6 and change this to 23 now let's see 1990 10 6 let me refresh see 6 10 1990 so here we have seen how we could get the date as a number as well as an ISO 8601 date format and this is the ISO 8601 date format why why why why - mmm - DD then T if you want to represent the time as well or else you can just represent yyy - mmm - building so here we have seen how we can process the date which is received as a number or SN is Oh 8601 date format next we will see how we can pass this information to a PHP file and process the and get the result back we will see it in the next lecture