You can change your language, time zone, time format and country from the CRM - Account Settings section. Based on the country locale that you select, the data format will be set in your account. To change locale information, do the following:

1. Click Setup > Personal Settings > Account Information.
2. In the Account Information page, click Edit.
3. Under Locale Information, choose the Language, Time Format, Time Zone and Country Local from the respective drop-down lists.
4. Click Save.