Windows scheduled job delayed after changing time

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Windows

scheduler

TaskScheduler

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favorite I am facing an issue and need your expert advice.

After changing timezone on frontend and DB servers i am facing issue where scheduled jobs are running late by one hour.

Time Zone in DB Server was: (GMT -5:00) Indiana (East) Time Zone in frontend Server was: (GMT -8:00) Pacific Time (US and Canada)

Timezone on both UI and DB server have been changed to EST so reflecting same time when checked on clock however i suspect this issue is somewhere related to time where changed clock time is not reflecting correctly everywhere and possibally on scheduled job.

i have 3 jobs scheduled at 4:00 AM,5:00 AM and 6:00 AM Monday however they are getting invoked after one hour. Means job which was supposed to run at 4:00 am is getting invoked at 5:00 AM, 5:00 am job got failed and 6:00 am job was run at 7:00 am.

Windows scheduled job is hosted on UI server which is invoked every hour - nothing has been changed here.

Do you see any possibility where even though clock time has been changed still changes have not been reflected at all places ? i hope server restart could make this reflection correct however need your advice on this issue.