Automatic Timezone Detection Using JavaScript.
http://pellepim.bitbucket.org/jstz/
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 556,426 websites that are jsTimezoneDetect Customers. We know of 266,594 live websites using jsTimezoneDetect and an additional 289,832 sites that used jsTimezoneDetect historically and 96,973 websites in the United States.
Get a list of 556,426 websites using jsTimezoneDetect which includes location information, hosting data, contact details, 266,594 currently live websites and an additional 274,792 domains that redirect to sites in this list. 289,832 sites that used this technology previously and 96,973 websites in the United States currently using jsTimezoneDetect.