Automatic Timezone Detection Using JavaScript.
http://pellepim.bitbucket.org/jstz/
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 424,139 websites that are jsTimezoneDetect Customers. We know of 200,906 live websites using jsTimezoneDetect and an additional 223,233 sites that used jsTimezoneDetect historically and 72,170 websites in the United States.
Get a list of 424,139 websites using jsTimezoneDetect which includes location information, hosting data, contact details, 325,372 currently live websites which includes 124,466 domains that redirect to sites in the list. 223,233 sites that used this technology previously and 72,170 websites in the United States currently using jsTimezoneDetect.