julianFromUnix static method
get julian from the dart date
Implementation
static julianFromUnix(DateTime unixDate) {
var date = '${unixDate.year}/${unixDate.month}/${unixDate.day}';
var dartDate = DateFormat("yyyy/MM/dd HH:mm:ss").parse('$date 18:00:00');
var unixTime =
((dartDate.millisecondsSinceEpoch / 86400000) + 2440587.5).floor();
return unixTime;
}