Automatic Timezone Detection Using JavaScript.
http://pellepim.bitbucket.org/jstz/
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 533,323 websites that are jsTimezoneDetect Customers. We know of 246,726 live websites using jsTimezoneDetect and an additional 286,597 sites that used jsTimezoneDetect historically and 93,565 websites in the United States.
Get a list of 533,323 websites using jsTimezoneDetect which includes location information, hosting data, contact details, 246,726 currently live websites and an additional 282,610 domains that redirect to sites in this list. 286,597 sites that used this technology previously and 93,565 websites in the United States currently using jsTimezoneDetect.