I have a date stored in the format dd-mm-yyyy. I want to store the day, date and year as individual variables, while getting rid of any leading zeros (e.g. "09-09-2010" is stored as 9, 9, 2010).
I attempted to use the code on this page to split the date by dashes, but it is throwing expression errors.
Some people, when confronted with a
problem, think "I know, I'll use
regular expressions." Now they have
two problems.
Coding Horror: Regular Expressions: Now You Have Two Problems
Investigate the ColdFusion functions month(date), day(date) and year(date).
Update: you can pass a string to these functions so long as CF can turn into a date.
When you say that you have a date
stored in the format dd-mm-yyyy
are you sure you aren't confusing this with the way that your database UI is presenting it to you or are you actually storing the date in this format (for example, by writing it this way to a text file or a varchar column rather than a DateTime column)?
The reason I ask is that if a date is stored in a database as a date then CF will represent it as a date irrespective of how it appears in, say, SQL Management Studio. If this is the case then you can simply split the parts out using DatePart("datepart", "date").
If you have a date in a text format (such as from a form submission or because it has been stored as plain text) then you should be able to parse it in to a DateTime object using LSParseDateTime() and then use the DatePart(...) method on it to split out the parts.
See http://livedocs.adobe.com/coldfusion/8/htmldocs/help.html?content=functions_c-d_30.html
(sorry, can't post the URL to the other function due to lack of SO points!)
for the documentation on this.
As an aside, if you are using SQL2005 (or later) then you can create computed columns on the date field in order to split out the day, year and month at the database level. I thought I'd mention this just in case it proves useful.
Steve
If you're working with a string in that format, there's no need for regular expressions.
myDate = "13-12-2010";
theDay = listGetAt(myDate,1,"-");
theMonth = listGetAt(myDate,2,"-");
theYear = listGetAt(myDate,3,"-");
Using the val() function will also drop leading zeroes, if any.
Related
I'm working with a project using Kettle (PDI).
I have to input multiple file of .csv or .xls and insert it into DB.
The file name are AAMMDDBBBB, where AA is code for city and BBBB is code for shop. MMDD is date format like MM-DD. For example LA0326F5CA.csv.
The Regexp I use in the Input file steps look like LA.\*\\.csv or DT.*\\.xls, which is return all files to insert it into DB.
Can you indicate me how to select the files the file just for yesterday (based on the MMDD of the file name).
As you need some "complex" logic in your selection, you cannot filter based only on regexp. I suggest you first read all filenames, then filter the filenames based on their "age", then read the file based on the selected filenames.
In detail:
Use the Get File Names step with the same regexp you currently use (LA.*\.csv or DT.*\.xls). You may be more restrictive at that stage with a Regexp like LA\d\d\d\d.....csv, to ensure MM and DD are numbers, and DDDD is exactly 4 characters.
Filter based on the date. You can do this with a Java Filter, but it would be an order of magnitude easier to use a Javascript Script to compute the "age" of you file and then to use a Filter rows to keep only the file of yesterday.
To compute the age of the file, extract the MM and DD, you can use (other methods are available):
var regexp = filename.match(/..(\d\d)(\d\d).*/);
if(regexp){
var age = new Date() - new Date(2018, regexp[1], regexp[2]);
age = age /1000 /60 /60 /24;
};
If you are not familiar with Javascript regexp: the match will test
the filename against the regexp and keep the values of the parenthesis
in an array. If the test succeed (which you must explicitly check to
avoid run time failure), use the values of the match to compute the
corresponding date, and subtract the date of today to get the age.
This age is in milliseconds, which is converted in days.
Use the Text File Input and Excel Input with the option Accept file from previous step. Note that CSV Input does not have this option, but the more powerful Text File Input has.
well I change the Java Filter with Modified Java Script Value and its work fine now.
Another question, how can I increase the Performance and Speed of my current transformation(now I have 2 trans. for 2 cities)? My insert update make my tranformation to slow and need almost 1hour and 30min to process 500k row of data with alot of field(300mb) and my data not only this, if is it work more fast and my company like to used it, im gonna do it with 10TB of data/years and its alot of trans and rows. I need sugestion about it
I want to format a COleDateTime as a CString, so i use
COleDateTime dt = GetMyDateTimeObj();
dt.Format(LOCALE_NOUSEROVERRIDE, GetCurrentLocaleID());
Since my program is multilanguage, GetCurrentLocaleID gives me the LCID currently selected (not in windows but in my program).
So the above gives me the correctly formated string according to the selected user-language but its always in a format "date-with-year + time-with-seconds". I think this is the short format of a date and the long format of the time accordong to windows regional settings.
What can i do to get the String with
- the year as just 2 numbers?
- completely without the year?
- the time-part without seconds?
Are there any switches to COleDateTime::Format that can give me year-as-2-digits, time-without-seconds but keeps fieldorder and separators specified by the LCID?
Of course i dont want to change any windows-regional-settings to do this and i dont want to use any fixed format-strings like _T("%d.%m.%Y %H:%M:%S") as this would break language-specific order of fields and separators.
Thanks for your hints and answers
Micha
In my application, server side date validations were done through IsDate which is very inconsistent in behavior. I used isValid("USdate",DateVar), that works fine with incoming dates, but when DateVar is a date time stamp it fails. Values coming in DateVar could be anything, a date, a time, a date & time or even some invalid data. If I use Date mask with isValid, that behaves like isDate and of no use. How I can accomplish this.
All "dates" that will be arriving via a request - be they via a URL parameter, a form submission, a cookie, etc - will be strings, not dates.
What you need to do is to work out what string formats you will allow, and validate them accordingly.
EG: you might decide that yyyy-mm-dd is OK, but you won't accept m/d/yy. You might pass them as three separate components for y, m and d. But you really oughtn't try to accept any old format, as you will need to have a validator for each format, and there's a law of diminishing returns there: people won't expect to use any format they like; they'll be expecting you to guide them. You also need to be mindful that if you ask me to type in today's date, I'd give you 4/5/2015. But to you that might represent April 5.
Given various month-length and leap-year rules, really the easiest and most reliable way to see if and input string represents a date in an acceptable format do this:
Validate the format mask, eg: if you're accepting yyyy-mm-dd, then the input needs to be \d{4}-\d{2}-\d{2}. Then at least you know the string has been formed properly.
Then extract the components from the string, and attempt to create a date object with them. If it doesn't error: it's OK.
Last: check any date boundaries within / outwith which the date needs to fall.
I am having problems formatting Excel datetimes, so that it works internationally. Our program is written in C++ and uses COM to export data from our database to Excel, and this includes datetime fields.
If we don't supply a formatting mask, some installations of Excel displays these dates as Serial numbers (days since 1900.01.01 followed by time as a 24-hour fraction). This is unreadable to a human, so we ha found out that we MUST supply a date formatting mask to be sure that it displays readable.
The problem - as I see it - is that Excel uses international formatting masks. For example; the UK datetime format mask might be "YYYY-MM-DD HH:MM".
But if the format mask is sent to an Excel that is installed in Sweden, it fails since the Swedish version of the Excel uses "ÅÅÅÅ-MM-DD tt:mm".
It's highly impractical to have 150 different national datetime formatting masks in our application to support different countries.
Is there a way to write formatting masks so that they include locale, such that we would be allowed to use ONE single mask?
Unless you are using the date functionality in Excel, the easiest way to handle this is to decide on a format and then create a string yourself in that format and set the cell accordingly.
This comic: http://xkcd.com/1179/ might help you choose a standard to go with. Otherwise, clients that open your file in different countries will have differently formatted data. Just pick a standard and force your data to that standard.
Edited to add: There are libraries that can make this really easy for your as well... http://www.libxl.com/read-write-excel-date-time.html
Edited to add part2: Basically what I'm trying to get at is to avoid asking for the asmk and just format the data yourself (if that makes sense).
I recommend doing the following: Create an excel with date formatting on a specific cell and save this for your program to use.
Now when the program runs it will open this use this excel file to retrieve the local date formatting from the excel and the specified cell.
When you have multiple formats to save just use different cells for them.
It is not a nice way but will work afaik.
Alteratively you could consider creating an xla(m) file that will use vba and a command to feed back the local formatting characters through a function like:
Public Function localChar(charIn As Range) As String
localChar = charIn.NumberFormatLocal
End Function
Also not a very clean method, but it might do the trick for you.
I need to pull a date out of a string. Since not everyone uses the official ISO format when printing their dates, it is impractical to write a date parser for every possible date format that could be used, and I need to handle as many date formats as possible - I don't control the data and can't expect it to come in a specific format.
This seems like a problem that has probably already been solved ages ago, but my Google-fu is too weak to find the solution. :(
Does there already exist a C++ library that, given a string, will return the month, day, year, hour, minute, second, etc that is referenced in that string, if any?
Pseudocode:
string s1 = "There is an expected meteor shower this Thursday,"
"August 15th 2013 at 4:39 AM.";
string s2 = "20130815T04:39:00";
date d1 = magicConverter(s1);
date d2 = magicConverter(s2);
assert(d1 == d2);
You might use the code from here, but you need to configure a mask, that tells the code which time format is used. If you write a class routine, that takes a mask and a string and gets you out the time and is able to print in any format you like, you should be well prepared. You have to look in more detail, if it also supports Daynames and Monthnames. I got it to work in python with a module providing a function that seems pretty much the same.
For more detail:
Please look at the example 2013-08-03 again. Nobody and as follows no computer is able to tell you if this date belongs to August or April, except of having a mask telling JJJJ-MM-DD or JJJJ-DD-MM. Also this library may tell you only standard masked times. So it might lead you to August in this case. But as you said it can be any date declaration, thus it does not need to follow standards, thus it can also mean March. An other possibility is to tell you about the date from the context (e.g. a table with a column of all te same time formats by looking for the increase (which would also fail if you just look at one day per month for just one year).
Another example... if I ask you 2013-05-04... to which month does it belong? You might tell me... April. I would reply "no, to the 4th of May" and vice versa for May and 5th of April. If you tell me how to solve this puzzle with two possible solutions I would understand your downvote... please think before downvoting someone trying to help you.