Automatic Timezone Detection Using JavaScript.
http://pellepim.bitbucket.org/jstz/
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 450,036 websites that are jsTimezoneDetect Customers. We know of 248,126 live websites using jsTimezoneDetect and an additional 201,910 sites that used jsTimezoneDetect historically and 84,049 websites in the United States.
Get a list of 450,036 websites using jsTimezoneDetect which includes location information, hosting data, contact details, 501,474 currently live websites which includes 253,348 domains that redirect to sites in the list. 201,910 sites that used this technology previously and 84,049 websites in the United States currently using jsTimezoneDetect.