How can I validate a date in Erlang?
What happens is that, for example, the date 2018-02-31 is a "valid date" in the sense that I can work with it. When I insert this date on a table (field date) it converts itself to 2018-03-03 (2018-02-28 + 3 days).
What I want is a way to let me know that the original date of my example (2018-02-31) is indeed an invalid date.
Thank you.
Try to use calendar module
calendar:valid_date(Date) -> boolean().
calendar:valid_date(Year, Month, Date) -> boolean().
You will receive true or false
The detailed information and correct input format is here Erlang Calendar Module
I found out that this works just fine for me:
calendar:valid_date()
Thank you.
Related
I want to convert date into a Day
I am using LibreOffice
I used some of its syntax weekday and text but it returns nothing
WEEKDAY("30-04-2019"; 1) is there any way to do that?
in google sheet i used =TEXT(C7758,"dddd") but it didn't work
how can I do that?
thanks in advance
Try the combination of functions WEEKDAY and DATE:
=WEEKDAY(DATE(2019;4;30))
The specific example will return 3 which is Tuesday (see all days and other options at https://wiki.openoffice.org/wiki/Documentation/How_Tos/Calc:_WEEKDAY_function)
Hope that helps.
I'm currently working with embarcadero c++, this is the first time I'm working with it so it's completely new to me.
What I'm trying to achieve is to get the current date, make sure the date has the "dd/MM/yyyy" format. When I'm sure this is the case I want to add a month to the current date.
So let's say the current date is 08/18/2016 this has to be changed to 18/08/2016 and then the end result should be 18/09/2016.
I've found that there is a method for this in embarcardero however I'm not sure how to use this.
currently I've only been able to get the current date like this.
TDateTime currentDate = Date();
I hope someone will be able to help me out here.
I figured it out.
After I've searched some more I found the way to use the IncMonth method on this page.
The example given my problem is as follows:
void __fastcall TForm1::edtMonthsExit(TObject *Sender)
{
TDateTime StartDate = edtStartDate->Text;
int Months = edtMonths->Text.ToInt();
TDateTime NextPeriod = IncMonth(StartDate, Months);
edtNextPeriod->Text = NextPeriod;
}
After looking at I changed my code accordingly to this
TDateTime CurrentDate = Date();
TDateTime EndDate = IncMonth(CurrentDate, 1);
A date object doesn't have a format like "dd/MM/yyyy". A date object is internally simply represented as a number (or possibly some other form of representation that really isn't your problem or responsibility).
So you don't have to check if it's in this format because no date objects will ever be in this format, they simply don't have a format.
You will have to do additions/subtractions on the Date object that the language or library gives you, THEN (optionally) you can format it to a human-readable string so it looks like 18/08/2016 or 18th of August 2016 or whatever other readable format that you choose.
It might be that the TRANSFER of a date between 2 systems is in a similar format, but then formatting the date like that is entirely up to you.
As for how to do that, the link you posted seems like a possible way (or alternatively http://docwiki.embarcadero.com/Libraries/Berlin/en/System.SysUtils.IncMonth), I'm afraid I can't give you an example as I'm not familiar with the tool/language involved, I'm just speaking generically about Date manipulations and they should ALWAYS be on the raw object.
I am trying to compare and check the date if it is today's date or not in a spesific program. I tried to use assertion method but when I use it the time will remain same if you try it next day. The main problem that I need to know when open a page from program It should be today's date and should be passed. if you know already anything about it please let me know also :)
Thanks yo!
Use System.DateTime.Now.ToString("yyyy-MM-dd") as one argument of the assertion. You may need to use a different format rather in the ...ToString() method. The exact format depends on how the date is shown on the screen.
This could be done using "StringAssert" to verify that your programs date string contains today's date string, while ignoring the time:
var programDateString = "7/25/2016 12:00:00"; //this is an example of your date retrieved from the application with time included
var todaysDate = System.DateTime.Today.ToShortDateString(); //short date string
StringAssert.Contains(programDateString, todaysDate);
I'm having some problems converting a string to a date object in google apps script.
My dates are in the following format, from a 3rd party API:
2013-01-17T17:34:50.507
I am attempting to convert this to a Date object:
return Date(stringDate);
And this is being returned:
Thu Jan 01 01:00:00 GMT+01:00 1970
Can someone tell me what i'm doing wrong, and how to resolve this issue ?
With moment.js, it is as easy as this to parse any of ISO 8601 format.
var date = Moment.moment("2013-01-17T17:34:50.507").toDate();
You can use moment.js to parse your arbitrary date string as well.
To use moment.js in GAS, you just need to add it in the script editor.
Open your script in GAS script editor and go to "Resources" then "Libraries...", then put this project key MHMchiX6c1bwSqGM1PZiW_PxhMjh3Sh48 and click "Add". Choose the version from the dropdown, then click "Save". Now, you are ready to use moment.js in GAS.
moment.js can be used to parse date string, create formatted date string, and many other date manipulation. Thanks to the author!
You can find the moment.js documentation here.
It doesn't appear that the Date object knows how to handle that date. The date is in ISO 8601 format. Javascript can handle Dates if they are given timezone information.
You will have to do some testing, but if those dates given to you are in UTC time, then just add a Z to the end of the date string before you call new Date().
Edit: The Apps Script Date object can't seem to handle a timezone other than UTC when parsing a Date. I opened an issue for it.
It doesn't work in GScript, at least for me at the time I'm writing it.
This post serves a working alternative: How do I format this date string so that google scripts recognizes it?
As of now new Date() seems to work:
var dT = new Date("2013-01-17T17:34:50.507");
console.info("dT: %s or %d", dT, dT.getTime());
returns dT: Thu Jan 17 17:34:50 GMT+01:00 2013 or 1.358440490507E12 in Google Apps Script
I'm a newbie so please help me in this. I have a datebox with a default date format and its working and displaying selected date in the box as expected.
Now, I need to get individual values from whats being displayed/selected, i.e., month, date, year. I need them to be used to query something in database.
Example : Displayed as July 14th, 2010. I require after displaying it in box, the numeric values as 7(for month), 14(for date), 2010(for the year).
Plese help, I'll be really thankful.
_ Chirayu Diwan
DateBox has a method getValue() which returns an obect of type java.util.Date. This class has individual method to get getYear(), getMonth() (offsets with 0, so 0 is January) and getDay().