public PersianDateTime AddSeconds(int seconds)
 {
     return(PersianDateTime.FromGorgian(Calendar.AddSeconds(DateTime, seconds)));
 }
 public PersianDateTime Add(TimeSpan offsetValue)
 {
     return(PersianDateTime.FromGorgian(DateTime.AddTicks(offsetValue.Ticks)));
 }
 public PersianDateTime AddMinutes(int minutes)
 {
     return(PersianDateTime.FromGorgian(Calendar.AddMinutes(DateTime, minutes)));
 }
 public PersianDateTime AddHours(int hours)
 {
     return(PersianDateTime.FromGorgian(Calendar.AddHours(DateTime, hours)));
 }
 public PersianDateTime AddDays(int days)
 {
     return(PersianDateTime.FromGorgian(Calendar.AddDays(DateTime, days)));
 }
 public PersianDateTime AddMonths(int monthes)
 {
     return(PersianDateTime.FromGorgian(Calendar.AddMonths(DateTime, monthes)));
 }
 public PersianDateTime AddYears(int years)
 {
     return(PersianDateTime.FromGorgian(Calendar.AddYears(DateTime, years)));
 }