public static string GetSupvLvlId(string emplid, int year, int month)
{
DateTime period_begin = new DateTime(year, month, 1);
DateTime period_begin_next_month = period_begin.AddMonths(1);
string supvLvlId = PsHelper.GetEmployeeSupvLvl(emplid, year, month);
//如果是本月15号后入职的，取下月15号前职务等级
if (supvLvlId == null)
{
supvLvlId = PsHelper.GetEmployeeSupvLvl(emplid, period_begin_next_month.Year, period_begin_next_month.Month);
}
return(supvLvlId);
}