Multiplicity of time standards

Nature 
The world was previously divided into 24 time zones based on 24 standard meridians 15 degrees apart in longitude, starting at Greenwich (UK). However, these theoretical divisions cut across states and divided adjacent areas inconveniently, so the division has therefore been considerably modified in practice. This modification has been carried further by the adoption (from time to time in different countries and at different times of the year) of summer-time or daylight saving measures. These time differences create considerable difficulty in setting up international timetables and maintaining time-based historical records. The multiplicity of time standards increases the difficulty of conducting international business, because of the limited overlap in working hours in different time zones. Some world-wide organizations are able to exploit these difficulties to their own advantage.
Broader 
Lack of international cooperation
Inadequacy of international standards
Obstacles to efficient utilization of time
Resistance to internationally agreed standards
Narrower 
Disruptive daylight saving
Related 
Inadequate world calendar
Differing conceptions of time
Aggravates 
Unpunctuality
Temporal imperialism
Economic inefficiency
Overloaded party lines
Desynchronization of bodily rhythm by international travel
Strategy(ies) 
Accommodating multiplicity of time standards
Reducing number of time standards
Value(s) 
Multiplicity
Type 
(F) Fuzzy exceptional problems