Check if has Push Notification Scheduled

I am in the middle of developing an app with Ionic Push Notification. I am thinking of how can I check if the logged in account has already scheduled push notification on that specific date. If yes, upon logging in, app won’t schedule a Push Notification but if nothing found, app will schedule a Push Notification.

Also, I am confused with the time of scheduling, because the time on ionic app dashboard push is different from my time.

Thanks in advance.