Can I get MJD (date and time) in LabVIEW 2012 SP1?

[Brad_Henry]

I need to time stamp my data before sending it to the file.  I have been doing this with the standard calendar date and time but MJD is what we prefer to use.  How can I get an MJD timestamp in LabVIEW 2012 SP1?

[udka]

Did you check this http://www.ni.com/example/26818/en/ ??

[0utlaw]

Hello Brad_Henry,

The Format Date/Time String will return the day of the year when the %j argument is used, as per this help document:

LabVIEW Help: Format Codes for the Time Format String

http://zone.ni.com/reference/en-XX/help/371361J-01/glang/codes_for_time_format_str/

If you're looking for the actual MJD, I'm not aware of a built-in function that generates this so you'll probably need to create or find a function to calculate it manually.  This should pretty basic arithmetic, and it looks like people have already made a few public examples, the first two search results here look to be just about what you need:

ni.com search:

http://search.ni.com/nisearch/app/main/p/bot/no/ap/tech/lang/en/pg/1/sn/catnav:ex/q/julian/

Regards,

[Brad_Henry]

Thank you but that does not give MJD, it gives JD.

Brad

[udka · Accepted solution]

Check the formula for converting JD to MJD
http://www.iers.org/nn_10828/IERS/EN/Service/Glossary/mjd.html

The Modified Julian Day (MJD) is defined as MJD = JD - 2400000.5 , where JD is the Julian Day