This Chrome extension uses a maps.google.com URL to extract the location of the current view. The latitude and longitude is run through tzwhere running on a web server. The timezone information returned is then displayed in the popup of the extension.
Sample screenshot:
/----------------------------------------------------------------------------\
|+-------------------------------------------------------------+ +---------+ |
||URL: https://www.google.co.in/maps/@15.4145997,76.4814041,6z | | Toolbar | |
|+-------------------------------------------------------------+ +---------+ |
| \---------+---------/ /\ |
| | +-----/ \-----+ |
| | | | |
| +-------------+ | Timezone | |
| | | Local time | |
| | | | |
| | +-------^------+ |
| +---------v--------+ | |
| | Web server | | |
| +------------------+ +-------+------+ |
| +------------------+ | Get TZ time | |
| | tzwhere | +-------^------+ |
+---------+--------+ |
| |
+---------------------------------+