Automatic Timezone Detection Using JavaScript.
http://pellepim.bitbucket.org/jstz/
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 613,465 websites that are jsTimezoneDetect Customers. We know of 232,984 live websites using jsTimezoneDetect and an additional 380,481 sites that used jsTimezoneDetect historically and 82,148 websites in the United States.
Get a list of 613,465 websites using jsTimezoneDetect which includes location information, hosting data, contact details, 232,984 currently live websites and an additional 265,278 domains that redirect to sites in this list. 380,481 sites that used this technology previously and 82,148 websites in the United States currently using jsTimezoneDetect.