sql - change next_run_time at a job -

i have jobs in sql , need change next run date , time code. have following stored procedure updates job, job not starts @ specified time:

create procedure [dbo].[pu_usp_update_ssis_package]     @job_id varchar(50) ,     @next_run_date int,     @next_run_time int begin     update          msdb.dbo.sysjobschedules      set          next_run_date = @next_run_date,         next_run_time = @next_run_time              job_id = @job_id end 

the data updated in table msdb.dbo.sysjobschedules job, don't know why job not starts

here updates stored procedure

create procedure [dbo].[pu_usp_update_ssis_package]     @job_id varchar(50) ,     @next_run_date int,     @next_run_time int begin declare @schedule_id int set @schedule_id = (select                          msdb.dbo.sysjobschedules.schedule_id                                               msdb.dbo.sysjobschedules                                               job_id = @job_id)      exec msdb..sp_update_schedule @schedule_id = @schedule_id,                             @active_start_date  = @next_run_date,                              @active_start_time = @next_run_time  end