How to append time stamp to TDMS file

hello all, i would like to append time stamp to a tdms file as the 1st column of the file... the pattern should look like this.. can anyone suggest how to create such a file?
Time
Data
0.001
2.5545
0.002
2.653
0.003
1.215
0.004
2.6586
Now on LabVIEW 10.0 on Win7

I got the below oepratin to do.. i used a Write to Measurement File.vi and selected tdms format and it worked out... however, when i read the same file using read measurement file.vi and selected tdms option in ti, i am observing that on the x-axis graph, i get real-time stamp instead of decimals... i want x-axis as decimals instead of timestamp, and when i selected decimals in waveform graph properties --> display format--> x-axis, i could not select decimal instead of time-stamp... can anyone please let me know how to get what i intend to do?
Now on LabVIEW 10.0 on Win7
Attachments:
Untitled 2.vi ‏68 KB

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How can i add a time stamp to tdms file?

I want the data and the time for the tdms file generated?
how can i do that?
should i cinvert .tdms to .lvm and use the data storage option or excel add on option for .lvm file created?
cant i directly have the time stamp for tdms file generated?

How are you acquiring the data in the first place? That will matter in how we want to approach this.
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How to write time stamp to a file

Hi,
I'm using LabVIEW 8.2 and for my simulations purpose I've to store my data with time stamp (seconds having 6 digit precision ) in a text file.
I'm using get time vi to get the time of the host computer on a 6 point precision (which I've attached also). My problem is I'm unable to convert this time stamp into string which can be written to text file directly. I would prefer to avoid the "unbundle cluster" which gives me individual elements (like seconds,date,time,year,day of the year, etc) and them convert each of them into a string.
Looking to hear from any one of you soon,
Regards
Attachments:
get time.vi ‏14 KB

Hi Roiht
You will never achieve 6 digits precision with the "get date/ time i seconds function" Perhaps 1 if you are lucky. But you can convert the time to string using the "format data/time string" function. You find it in the same palette as the other time functions.
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Customizing Time Stamp In Receiver File Adapter

Hi,
I am working in a XI to file adapter scenario.
The default time stamp in receiver file adapter is yyyyMMdd-HHmmss-SSS.
I want to time stamp as "ABC_MM_DD_YYYY_HH_MM_SS".
i searched SDN,but not getting an end to end approach.
Like...I developed a UDF ,but when I map it to receiver root node..I am getting error.
Please help.
Just request for a step by step procedure.
Also,ASMA is not v clear to me......
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Hi sriparna,
The timestamp used by the File Receiver Adapter is a default pattern, to achieve that you have to use a UDF in the middle of the MM and set the receiver file name with the ASMA, read this for further information:
´´´´ Dynamic Configuration vs Variable Substitution - The Ultimate Battle for the File Name
/people/shabarish.vijayakumar/blog/2009/03/26/dynamic-configuration-vs-variable-substitution--the-ultimate-battle-for-the-file-name
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Please search the forum

Append time stamp as a column in an excel file

Hi
i want to add timestamp to the last column of my excel file
my data is this
columnA columnB column C columnD
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74.212 73.122 73.222    11AM:23:59.012
73.444 73.223 74.322    11AM:24:02.083
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and continue
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help
Solved!
Go to Solution.

You have at least two possibilities: One is to do the formatting yourself with string functions and write the data as a text file or an array of strings.
Another is to convert the timestamp to a Double and save it as numeric data. This is only useful if your are going to read the data back into LV and analyze it there, because Excel's numeric representation of date and time is different from that used by LV.
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How do you vary the Date/Time stamp format in File Adapters

In the receiver channel of the File Adapter where you specify the 'File Name Scheme', you do have the option of specifying a 'File Construction Mode' of 'Add Time Stamp'. How can you specify a different Date/Time stamp format ( eg MM/DD/YY vs YYYYMMDD vs MMDDYY, etc. ) without changing the Date/Time stamp for the entire SAP system? Also, can you control where the Date/Time stamp appears in the filename?

Hi,
There are many threads discussing the same issue. Go thro the following:
Dynamic file name (Date) in Receiver File Adapter
Receiver File Adapter - TimeStamp
Bhavesh's reply in above thread:
You can use Adapter Specific Identifiers and then change the file name in the mapping. Append the tiem stamp in the format that you want and so on.
Just use this code in an UDF,
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
String SourceFileName = conf.get(key);
java.text.SimpleDateFormat dateformat = new java.text.SimpleDateFormat( "yyyyMMdd" );
dateformat.format( new java.util.Date() );
String newfilename=SourceFileName+dateformat;
// change to new file name
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return "";
Regards,
P.Venkat

How to write Date/Time property of tdms file

On the root page of the tdms file, there is a built-in property called "Date/Time" in the first row.
I would like to use it to save the time stamp when the tdms file is created. But in the help file,
I only find the following property constant. So, how can I write to the "Date/Time" property field?
Property
Constant
Data Type
Name
TDMS_FILE_NAME
String (char *)
Description
TDMS_FILE_DESCRIPTION
String (char *)
Title
TDMS_FILE_TITLE
String (char *)
Author
TDMS_FILE_AUTHOR
String (char *)
Thanks for any idea or suggestion.
Solved!
Go to Solution.

Not sure if this is exactly what you want, but have you tried this?
CVIAbsoluteTime CVItime, *t = NULL;
TDMSFileHandle deH = 0;
// Create TDMS file and set some properties
errChk (TDMS_CreateFileEx (file, TDMS_Streaming2_0, TDMS_ByteOrderNative, 0,"example.tdm", "someText", "title", "author", &deH));
GetCurrentCVIAbsoluteTime (&CVItime);
errChk (TDMS_SetFileProperty (deH, "Date/Time", TDMS_Timestamp, CVItime));
// Save and close file
errChk (TDMS_SaveFile (deH));
TDMS_CloseFile (deH);
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
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Insert time stamp in ASCII file

Hi all!
I am trying to log data values from several channels (so far 4) into one ASCII file including a time stamp in the first column.
The goal is one file that contains one time stamp per row (in the first column) and one column per channel. It may looks like this:
TIME Ch1 Ch2 Ch3 Ch4
t1        a1     b1     c1    d1
t2        a2     b2     c2    d2
I want to save one row (time stamp and 4 channels) each minute as above into the same file. Nice would be to creat a new file each day.
Problems:
1. Using the "Save to ASCII/LVM" step: How can I get SignalExpress to insert a time stamp in the first column of each row?
    I have no problem inserting the 4 signals that generate me one column per signal. And using "Overwrite once, then append to file" I get one file for all signals.
    Any idea how to insert a time stamp this way? Or how to creat a new file every 24 hours?
2. Another way I tried is to use the "Recording Option". But how can I get all the four signals saved in one file?
    After the DAQmx acquisition step I process the 4 channels individually (one scaling step and one threshold step per channel - because of different factors per channel).
    Activating the Recording Option (which would generate a new file every 24 hours, but not starting at 12pm each day...) I get 4 single TDMS-files (and their corresponding tdms_index and meta.txt files),
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SSC
PS: I work with SignalExpress 2.5 and have a NI USB-6210 connected.

In the recording options tab you can set a stop condition to be 24 hours of data. And then select the "Restart Log Automatically" option to start logging for another 24 hours. You can also configure the logging to auto create an ASCII file once logging stops. With this configuration an ASCII file will be created every 24 hours. To enable ACSII file generation, select Tools>>Options.. And then set "Automatically export log to ASCII file to true".
I believe that you will get one ASCII file for each TDMS file. If you are logging 4 channels from the same device you should be able to log the entire group which would allow you to get only 1 TDMS / ASCII file.

Transfer time stamp from text file into MS Access thru Labview

Hello everyone,
I am Cruz; Long time listener, First time caller.
I am currently monotoring data being collected by an oven. The data is stored in a text file. I am using Labview to take the data from the textfile and place it in an MS access DB for manipulation. The first three columns of the text file are the time stamp of data. When i transfer the data into Access i cant get the first three columns to display as a time stamp. Can have some pointers on what how to get the first three columns to display correctly.
Additional info:
the text file is a 1D array that gets overitten with every new mesurement tanken. the transfer to Acces is to not loos any of the information and to better manipulate the data into forms and such.
Running Labview 2010
attached is code and text file.
Any help is greatly appreciated.
Attachments:
Oven test other.vi ‏16 KB
datalog032010003.txt ‏1 KB

Your first mistake is reading the file as DBL. Your first three columns are obviously not numeric values. Did you ever look at the output array? Read it as strings. Second, you would need to combine those first three columns to create an actual time stamp before you write to the db. Unless of course you have one column for date, one column for time, and one column for AM/PM. I would not recomend that type of structure in the db.

Date and time stamp for the file

Hi Experts,
My Requirement is to create a csv file with the name testfile_date&timestamp.
If i select add time stamp in the receiver file communication channel the file be as testfile_yyyymmdd_hhmmss_XXX.
The XXX is message id which comes by default by selecting add timestamp option.
but, i don't want the message id displayed in the file name.As i know from the blogs we can reach this requirement as per Michels blog
/people/michal.krawczyk2/blog/2005/11/10/xi-the-same-filename-from-a-sender-to-a-receiver-file-adapter--sp14
I am not clear in the mapping. after writing the udf, to which filed i need to map with that udf.
can you please tell me stel by step how how to do mapping and how to achieve the requirement. request you to send the code forthe udf.
Thanks
Rahul

Hi,
you can wirte udf and map it to root element of the target message type. u just need to execute the udf.
UDF:
// UDF havs one input parameter - timestamp
Code:
DynamicConfiguration conf = (DynamicConfiguration) container .getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
String OldFileName = conf.get(key);
String newFileName = "";
if (OldFileName != null) {
newFileName = "testfile_" +timestamp ;
conf.put(key, newFileName);
return newFileName;
Mapping:
Date (standard function) [Formmat yyyyMMdd_hhmmss] -> UDF -> MesageType.
Thanks.
Ritu

Time Stamp format from file problem

Hey there,
I have a pretty peculiar problem. I'm working on two PCs right now, one is my private laptop running on Windows 8, and the other one the PC at my workplace, running on Windows XP, but on the same version of LabVIEW. I use this method to save the time and date to a tab delimited .txt file. Then later, with another VI, I read the date and time written to file to reconstruct the time stamp. I've noticed that dates written to file from my workplace differ from the dates written from my private PC: in Windows XP, there are "-" separating the day, month and year. In Windows 8, it's "/". There are other differences (see pictures). So naturally, when reading from file using my VI, I can only read on my private PC files (or at least dates) written on my private PC and vice versa, I can't read files written on my private PC on my workplace PC. Can anybody tell me why there's a difference in format, or how to write the date uniformly so I can read it on any PC, or how to read both formats?
So this is the method I use for writing the time and date (the subVI only inserts a certain number of TAB characters).
This is what it looks like on Windows 8
This is what it looks like on Windows XP
This is the VI (attached) I use to read the time stamps (the first row actually contains the time stamp in HH:MM: SS format for a whole bunch of measurements).
Have a nice day.
Solved!
Go to Solution.
Attachments:
Extract Time Stamps.vi ‏22 KB

I would suggest using the ISO-8601 UTC format.
The only limitation is that the string value is in reference to GMT.
The conversion of the string back to a timestamp will present the date/time on your front panel indicator as local time.
https://lavag.org/topic/15034-timestamp-support-for-format-into-string-scan-variant-from-string-stri...
Now is the right time to use %^<%Y-%m-%dT%H:%M:%S%3uZ>T
If you don't hate time zones, you're not a real programmer.
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Plotting Time Stamp from Txt file in Column to another column

I want to know how to plot 2 columns that i am reading from a text file.
column 1 has a time stamp in HH:MMS, and column 5 has data in which i want to plot the time verus the data.

The Scan from String function will do most of those conversions in a single step. Here are a couple of examples. You will still need to read the array of strings in and process in a loop.
Message Edited by DFGray on 03-19-2010 07:46 AM
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How to append time stamp to TDMS file

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