How to convert date to hexadecimal in Java

I am not familiar with Java. I need to get the current datetime and express it as a string, for example:

#1:135790246811221:1:*,00000000,UP,060B08,0D1908#

060b08 is yymmdd: GPS date (November 8, 2006) 6 characters, hexadecimal

And 0d1908 are hhmmss: sending time, 6 characters, hexadecimal

Yymmdd: sending date (13:25:08), hexadecimal, for example: 060b08

I'm trying this Code:

Calendar cal = Calendar.getInstance();
Date date = new Date();
String date_str = String.format("%02x%02x%02x",cal.getTime().getYear(),cal.getTime().getMonth(),cal.getTime().getDay());
String hour_str = String.format("%02x%02x%02x",cal.getTime().getHours(),cal.getTime().getMinutes(),cal.getTime().getSeconds());
String content = "#1:" + imei + ":1:*,"+ date_str.getBytes() +","+ hour_str.getBytes()+"#";
ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
buf.writeBytes(content.getBytes(Charset.defaultCharset()));
channel.write(buf);

But wrong, returning:

#1:359672050130411:1:*,[B@7f07ff6a,[B@d4dd3b6#

Solution

Calendar. Gettime() returns date

Ideally, you should use calendar Get (calendar. Year) and calendar get(Calendar.HOUR_OF_DAY).

The same applies to month, day, minute and second

After getting the integer value, you can use integer Tohexstring() converts them to hexadecimal if necessary