standard time

time scale [...] derived from UTC [...], by a time shift [...] established in a given location by the competent authority EXAMPLE 1:Some standard times do not vary within a year, such as US Eastern Standard Time (EST), US Eastern Daylight Time (EDT), Australia Western Standard Time (AWST), China Standard Time (CST), Hong Kong Standard Time (HKT), Korea Standard Time (KST) and Japanese Standard Time (JST). EXAMPLE 2:Some standard times vary within a year, such as US Eastern Time (ET) and Australian Central Standard Time (ACST). Note 1 to entry: The time shift of a standard time may vary in the course of a year, such as due to daylight savings. [SOURCE:IEC 60050-113:2011, 113-01-17, modified — The original NOTE has been deleted; EXAMPLE 1 and 2 and Note 1 to entry has been added.]