Urgent: How do I make time zone show correctly in Log a Call?

Urgent: How do I make time zone show correctly in Log a Call?

Hi,
I have changed the time zone via Edit in Company Details, and it shows correctly when I have logged in again. However, when I Contacts>Log a call the time is consistently shown +5 hours, though minutes and date are correct. Please reply soon as I need to make many calls in the comming days.
Thanks.