Automatic Timezone Detection Using JavaScript.
http://pellepim.bitbucket.org/jstz/
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 502,663 websites that are jsTimezoneDetect Customers. We know of 216,953 live websites using jsTimezoneDetect and an additional 285,710 sites that used jsTimezoneDetect historically and 75,275 websites in the United States.
Get a list of 502,663 websites using jsTimezoneDetect which includes location information, hosting data, contact details, 216,953 currently live websites and an additional 233,996 domains that redirect to sites in this list. 285,710 sites that used this technology previously and 75,275 websites in the United States currently using jsTimezoneDetect.