Share your experience!
Hi guys
for alarm :
you can try to clear cache and data , by doing
settings -> apps ->all -> clock -> clear cache/data ,then you can restart phone do disable the clock and enable back, you can find this option where you found clear cache
about battery :
after updating it takes time , same happened to my phone when i did updated the software (which is not 4.3)
what I did
i read in some post saying, charge the battery for entire night(only once)!!! after updating, i felt what it does, but believe it did some trick, so before i going to bed, i kept my phone to charge for entire night, then morning restarted phone, from then i dont had any issues about battery, i am not sure it might work for you people, but worth a shot
let us know
Manjuboyz 
NOTE:
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Thanks for the advices, Manjuboyz. I have followed your instructions but the clock stills work weird (again without the options of adding/deleting alarms sometimes) and, the battery drains so fast that I needed to charge the phone the second time within one day even while the Stamina was switched on and during Sleep (Standby) Mode.
Hi Yun6
>thanks for trying , what i can suggest is , if you have all data backup try to do Restoring the phone(you will be losing all data), any software glitch will be resolved doing so, try this it worth a shot
Manjuboyz 
NOTE:
Rate me(Kudos) If you are happy with my Resolution, Thanks 
Hi Yun6
>this is what we can do to help till restoring the phone, if you have any Sony Center available nearby, i suggest you drop by so that they may suggest you or fix the problem which your phone is facing
Manjuboyz 
NOTE:
Rate me(Kudos) If you are happy with my Resolution, Thanks 
When you tap to add new alarm and have adjusted the settings to what you want then in the top left corner you may have a tick which you need to tap to save the alarm and it's settings