bcd-date

bcd-date
========


Node.js package to decode BCD datetime buffers used by Siemens and Rockwell PLCs into a normal javascript date objects.

The format of the BCD date is as follows

| Byte | Contents | Range |
|----------------|----------------------|-------|
| 0 | Year | 90-89 |
| 1 | Month | 1-12 |
| 2 | Day | 1-31 |
| 3 | Hour | 0-23 |
| 4 | Minute | 0-59 |
| 5 | Second | 0-59 |
| 6 | 2 MSD of ms | 0-99 |
| 7 (1st nibble) | LSD of ms | 0-9 |
| 7 (2nd nibble) | Day of week (unused) | 1-7 |

example
=======

var bcdDate = require('bcd-date');

var buffer = new Buffer('1012231130301235', 'hex');

var date = bcdDate.decode(buffer);
var buffer = bcdDate.encode(date);

// date == date at 2010-12-23 11:30:30.123
// buffer == buffer of 1012231130301235

// decode as UTC
var date = bcdDate.decode(buffer, true);

// encode as UTC
var date = bcdDate.encode(buffer, true);