What ISTTime.now covers
IST the time standard: UTC+5:30, the half-hour offset and its history, IST converters, other IST meanings (Irish, Israel). Not Indian cities (timein.ist) or India practicalities (indiatime.now).
How the time data is calculated
Live clocks and offsets use the IANA time zone database. Place names and geographic relationships use GeoNames data. Daylight-saving transitions are calculated from the rules available to the application rather than copied from a static clock.
Editorial approach
Guides are organized around the purpose of this domain, checked against the underlying time-zone data, and updated when rules or scheduled dates change. The site does not claim atomic-clock precision: the displayed time also depends on the clock and connection of the device viewing it.