Does everyone share a fixed way of thinking about the concept of time? However, often wherever and whenever one attempted to describe objectively in a common language this subjective mindset of time everyone failed to agree on its true meaning and purpose.

Nonetheless, in global commerce there is an agreement that the international dateline does not follow any great longitudinal circle. In fact, this line zigzag around a centralized longitude, perhaps to equalize the number of island nations found on either side. This dateline is chosen to fall on the sparsely populated Pacific Ocean wide distance from busy metropolitan areas. The purpose could be to avoid making business appointments that can be one day early or one day late for someone standing exactly over the imaginary dateline. http://en.wikipedia.org/wiki/International_Date_Line