gregorianToJalali method
dynamic
gregorianToJalali
(int y, int m, int d, [ String separator ])
Implementation
gregorianToJalali(int y, int m, int d, [String separator]) {
var sumMonthDay = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
var jY = 0;
if (y > 1600) {
jY = 979;
y -= 1600;
} else {
jY = 0;
y -= 621;
}
var gy = (m > 2) ? y + 1 : y;
var day = (365 * y) +
((gy + 3) ~/ 4) -
((gy + 99) ~/ 100) +
((gy + 399) ~/ 400) -
80 +
d +
sumMonthDay[m - 1];
jY += 33 * (day.round() / 12053).floor();
day %= 12053;
jY += 4 * (day.round() / 1461).floor();
day %= 1461;
jY += ((day.round() - 1) / 365).floor();
if (day > 365) day = ((day - 1).round() % 365);
int jm;
var jd;
int days = day.toInt();
if (days < 186) {
jm = 1 + (days ~/ 31);
jd = 1 + (days % 31);
} else {
jm = 7 + ((days - 186) ~/ 30);
jd = 1 + (days - 186) % 30;
}
var persionDate;
if (separator == null)
persionDate = [jY, jm, jd];
else
persionDate = "$jY$separator$jm$separator$jd";
return persionDate;
}