How to convert int64 value to date

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hii guys i have a value which is in int64 value i need to convert it into date
my reference code which is in java

else
                {
                    String dateString = DateFormat.format("dd/MM/yyyy", new Date(Item.CompletedDate*1000)).toString();
                    textView_completeddate.setText(dateString);
                }

i neeed this to convert into c#

What I have tried:

my code is

else
                   {
                       DateTime dateTime= new DateTime(item.CompletedDate);
                          var date = dateTime.ToString("MM/dd/yyyy");

                       string result = date.ToString();
                   }

the value will be in

1605584420

Posted 2-Jan-23 23:03pm

alisa brigita

Updated 2-Jan-23 23:55pm

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Richard MacCutchan 3-Jan-23 5:14am

What is the problem?

alisa brigita 3-Jan-23 5:23am

i can,t get the correct date

2 solutions

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OriginalGriff · Answer 1 · 2023-01-02T23:55:00

Solution 2

The Java Date constructor you are using expects milliseconds since January 1, 1970, 00:00:00 GMT - C# works in Ticks which aren't the same at all: Date (Java Platform SE 8 )[^]

I'd construct a DateTime object at Jan 1 1970, then use the DateTime.AddMilliseconds(Double) Method (System) | Microsoft Learn[^] method to convert your Java value to C#.

Posted 2-Jan-23 23:55pm

OriginalGriff

Comments

alisa brigita 3-Jan-23 6:25am

its not working

OriginalGriff 3-Jan-23 6:56am

"its not working" is probably the most useless problem report we get - and we get it a lot. It tells us nothing about what is happening, or when it happens.
So tell us what it is doing that you didn't expect, or not doing that you did.
Tell us what you did to get it to happen.
Tell us any error messages.

Perhaps show us the exact code you used as well?

Richard MacCutchan · Answer 2 · 2023-01-02T23:24:00

Solution 1

Your value for conversion is not correct. The following code returns today's date in ticks as specified at DateTime Constructor (System) | Microsoft Learn[^].

C#

DateTime dateTime = DateTime.Now;
var ticks = dateTime.Ticks;
Console.WriteLine($"dateTime: {ticks}");

And the result is:

dateTime: 638083380629232554

Posted 2-Jan-23 23:24pm

Richard MacCutchan

Comments

alisa brigita 3-Jan-23 6:24am

i need only the date in date formate dd/MM/yyyy

Richard MacCutchan 3-Jan-23 6:31am

Well you still need to start with a valid number to make a valid date.