Writes the {@link PDMTimestamp} as 8 bytes into the byte array at position

C# |
public virtual int writeTimestamp( byte[] ba, int pos, PDMTimestamp ts )

- ba (array< Byte >[]()[])
- the byte array
- pos (Int32)
- the starting position
- ts (PDMTimestamp)
- the PDMTimestamp to write

the updated position in the byte array after the write