Rename multiple file types

hello,

I have several file type 2003_050
With the year 2003 and the day 050 days of the year, making March 19.
I want to use a program to convert all my file number in dd / mm / yyyy.

Thank you for your reply

Frankly, I rather recommend yyyy-mm-dd format (for correct sorting in Explorer).

But apart from that, no, I do not know of any program for that.

Yes you're right but no matter what the format is essential to make the conversion.
Thanks for your suggestion.

For the conversion you can do like this:

conv.bat

Code:

---

@ echo off

  set example = 2003_050

  :: Extraction of the Year
  set A =% EXAMPLE: ~ 0.4%

  :: Extraction of Quantième
  set / a Q = 1% EXAMPLE: ~ 5,3% - 1000

  :: Calculation of Julian day from 1 January of the year%% A +% Q% days
  set / a = JJ% Q% + ((1461 * (% A +% 4800 + (1 - 14) / 12)) / 4 + (367 * (1 - 2 - 12 * ((1 - 14) / 12 ))) / 12 - (3 * ((%% A + 4900 + (1 - 14) / 12) / 100)) / 4 + 1 - 32075) - 1

  :: Convert Julian Day to Day (% J%), Month (M%%) and Year (% A%)
  set / a T0 =% DD% + 68569
  set / a T1 = (T0 *% 4%) / 146097
  set / a T0 = T0%% - (146097 *% Q1% + 3) / 4
  set / a T2 = (4000 * (%% T0 + 1)) / 1461001
  set / a T0 = T0%% - (1461 *% Q2%) / 4 + 31
  set / a T3 = (80 *% T0%) / 2447
  set / a J = T0%% - (2447 *% Q3%) / 80
  set / a M =% Q3% + 2 - (12 * (% Q3% / 11))
  set / a A = 100 * (% Q1% - 49) +% +% Q2 (% T3% / 11)

  :: Formatting resultat
  if% J% LSS 10 set J = J% 0%
  if% M% LSS 10 set M = M% 0%

  echo.
  Before conversion echo:%% EXAMPLE
  echo after conversion:% A% M% _% _% J%
  echo.  & Pause

---

Result

Quote:

---

Before conversion: 2003_050
After conversion: 2003_02_19

Press any key to continue ...

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I thank you for your answer but I am not programming savvy therefore you can tell me how to run this program (with what software);
On the other hand is what the code you have given m I can directly rename a file or I have to do an extra manipulation?

Actually I managed to run the script by creating a bat file. But how I do I do if I want to rename the file name.

Thank you for your answer