add method
add days
, months
and years
separately
note: it does not make any conversion, it simply adds to each field value
for subtracting simple add negative value
UNSAFE
throws on null arguments
non-null
Implementation
@override
Jalali add(
{int years = 0,
int months = 0,
int days = 0,
int hours = 0,
int minutes = 0,
int seconds = 0}) {
ArgumentError.checkNotNull(years, 'years');
ArgumentError.checkNotNull(months, 'months');
ArgumentError.checkNotNull(hours, 'hours');
ArgumentError.checkNotNull(minutes, 'minutes');
ArgumentError.checkNotNull(seconds, 'seconds');
if (years == 0 &&
months == 0 &&
days == 0 &&
hours == 0 &&
minutes == 0 &&
seconds == 0) {
return this;
} else {
return Jalali(year + years, month + months, day + days, hour + hours,
minute + minutes, second + seconds);
}
}