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);