The binary file contains 8 bytes of type TDateTime (Date and Time), how in C # to read and convert to type DateTime?

  • And what kind of data storage format is there? - Vladimir Martyanov
  • @ Vladimir Martiyanov do not know. - creamsun
  • I correctly understand, what in the binary file TDateTime contains? And they need to be correctly considered in the application C #? - kami
  • @kami likely yes .. - creamsun
  • 2
    TDateTime in Delphi is a simple Double. - BlackWitcher

2 answers 2

Since Delphi uses the Double type to store the date / time, you can read the time value into a double variable. And then try to convert to System.DataTime in C #. For example, try this:

  Double dbl = 65985.3333; //Значение прочитанной переменной из бинарника. DateTime dt = DateTime.FromOADate(dbl)
  • double time turned out to be 1.92571966779543E-319 dt turned out {12/30/1899 0:00:00} - creamsun
  • Probably something wrong is happening ... Proof: blogs.nimblebrain.net/index.php/… - BlackWitcher
  • Your method works, you just had to count in a certain way, change the bytes and bits in a certain order, and then reassemble, convert and double the array of bytes, and then in time! Thank you ! - creamsun
  • It's my pleasure. Yes, and this method is not mine) It was just originally assumed that these 8 bytes from the binary will be read exactly as TDataTime Delphi, i.e. just Double, and then we transfer them to DataTime in C #. In any case, glad. what earned! - BlackWitcher

I don’t know when I had a similar problem, it was solved quite simply in the structure a variable was created public DateTime t_k; and it reads data from a binary file using Marshal