Standard times are developed from work measurement which is a systematic procedure that is employed to determine the time required to perform work tasks using the "best" method. Standard data is predetermined leveled times are established for basic body motions, such as reach, move, turn, grasp, position, release, disengage, and apply pressure.
Standard Time Zones of the World World time zones are listed below according to time zones' standard time. One time zone is 15 degrees longitude and there are 24 of them. Altogether there are 40 time zones that are offsets from Coordinated Universal Time (UTC) by a whole number of hours from UTC-12 to UTC+14 or which are offsets of 30 or 45 minutes.
standard time n. The time in any of 24 time zones, usually the mean solar time at the central meridian of each zone. In the continental United States, there are four standard time zones: Eastern, using the 75th meridian; Central, using the 90th meridian; Mountain, using the 105th meridian; and Pacific, using the 120th meridian.