I want to perform Type Conversion of Date Type Value

Question

Here is what I need to do:

I need to convert date and time in hex code for writing it on IOT device. Here is my code

private String getDateTimeToHexa() { 

Calendar mCalendar = Calendar.getInstance();
TimeZone gmtTime =  TimeZone.getTimeZone(TimeZone.getDefault().getDisplayName());

    mCalendar.setTimeZone(gmtTime);
    final Date date = mCalendar.getTime();
    return Long.toHexString(date.getTime());
}

It is returning 11 digits hex code I need 8 digits, just like date and time in hex is 47C7EDE0 for this date 12:34:56 29/Feb/2008

Answer 1

Instead of returning

return Long.toHexString(date.getTime());

Return following

return Long.toHexString(date.getTime()/1000);

As correctly pointed out by @shmosel that date.getTime() return time in a millisecond and if you want 8 digit Hex format then it needs to be converted in the second format.

The return type of Date can be found here