Hello all,

Is there a function in Tia portal to convert a Julian date yyddd to calendar date dd-mm-yyyy?

I tried to swap the formule for calculating the Julian date, but that wasn't a succes.

Does anybody know a possibility to convert the Julian date to a normal date?

Thanks for your reply!

What you say is from a cpu date to a Julian date if I am right?

But Julian date is given as an input and has to be converted to a calendar date in my situation.  

To convert the Julian date to a calendar date in TIA use next steps:

1. If your year in Julian date is in 2024 Create LDT Tag StartLDT with value
    LDT#2023-12-31-14:00:00. Otherwise create same tag with date of
    last day of previous year from your Julian date year.

2. Create LT Tag JulianLT with value LT#123D if your Julian Day is 123
    otherwise change 123 with your ddd.
    Create also LT tags StartLT, and ResultLT.

3. Use T_CONV to convert StartLDT to StartLT

4. Use T_ADD to add StartLDT and StartLT and store in ResultLT.

5. Create LDT tag ResultLDT.

3. Use T_CONV to convert ResultLT to ResultLDT

You will have calendar date in ResultLDT tag.