Get UTC Time, Convert a UTC time to Datenum (supports vectors, Win/Linux)

Get a UTC time using standard C time function, convert UTC time to MATLAB serial date ...

Description

UTC time (universal time convention) is used in ANSI-C standard for defining time. This is measured in seconds since 1970, at the Prime Meridian. By definition, UTC does not depend on Daylight Savings Time. The UTC_TIME function uses a C-MEX function to get the System Time in UTC format.

Another function UTC2DATENUM will convert any UTC time to the correct MATLAB serial date number in local time, accounting for Daylight Savings. This is done with the help of the C-function gmtime. Vectors are supported. The difference of the local time from UTC is also provided as an output.

• Acknowledgements: This submission has inspired the following:; Get UTC Time, Convert a UTC time to Datenum (both Win32/Linux versions), Convert Time Array to a Datenum Array (Win32)
• MATLAB release: MATLAB 7.2 (R2006a)
• Other requirements: MEXW32 files included for Windows. mexCompile script to build for Linux is included.

[Bulent Bayraktar]

Great, Abe! :)

[K Reese]

Great idea. Clearly mathworks forgot about time zone conversions. However, your function does not handle arrays of dates, and it displays an unneeded message in the command window.

[Richard Sonnenfeld]

Just what I was looking for, but the .dll is for Windows, not Linux. Ah well. This could
be coded native to Matlab -- It's just a pain in the neck. Was hoping someone else did it!

[Richard Sonnenfeld]

Worked through the issues of how to use this in Linux. If .mex these
C-functions. (In Linux do e.g.
mex -lm -o utc_time.mexglx utc_time.c) ,
then you don't need the DLL at all. Just use the two m-files and two c-files provided and it just works! Thank you Dr. Cohn!

[ralph habib]

i want to convert real time to GPs time..can u help?and i tried to download but..it didn't work..if u can help plz send mail to [e-mail]

[Klaps Jos]

Dear,

I downloaded the file but..it didn't work, see comments of Matlab Command Window below..if u can help plz send mail to [e-mail]

Command Window:
??? Input argument "din" is undefined.

Error in ==> datepart at 43
[r,c]=size(din);

>>

[Abraham Cohn]

Hello, in response to Klaps Jos:
I searched the code for "datepart", and it is not part of the submission ... this must be part of your calling code. So to debug your error, please check the syntax of your function "datepart". Thanks, and good luck.

[Albert Steiner]

Hello everybody
I would recommend using directly java.lang.System.currentTimeMillis
Example: utc_time = java.lang.System.currentTimeMillis;
(assuming you have JAVA installed)

One advantage is also, that it is in milli seconds as required.
Best wishes, Albert