Acronym Definition
IDLW International Date Line West (GMT-1200)
http://acronyms.thefreedictionary.com/International Date Lin...


The International Date Line (IDL), also known as just the Date Line, is an imaginary line on the surface of the Earth opposite the Prime Meridian which offsets the date as one travels east or west across it. Roughly along 180° longitude, with diversions to pass around some territories and island groups, it mostly corresponds to the time zone boundary separating +12 and −12 hours GMT (UT1). Crossing the IDL traveling east results in a day or 24 hours being subtracted, and crossing west results in a day being added.
The first date-line problem occurred in association with the circumnavigation of the globe by Magellan's expedition (1519–1522). The surviving crew returned to a Spanish stopover sure of the day of the week, as attested by various carefully maintained sailing logs. Nevertheless, those on land insisted the day was different. Although now readily understandable, this phenomenon caused great excitement at the time, to the extent that a special delegation was sent to the Pope to explain this temporal oddity to him.
http://en.wikipedia.org/wiki/International_Date_Line

Međunarodna datumska granica
Izvor: Wikipedija
Međunarodna Datumska Granica (International Date Line)
Međunarodna datumska granica je zamišljena linija na zemlji, suprotno od Griničkog meridijana koja nadoknadi datum kako je prijeđeš. Podudara se otprilike uz 180° zemljopisne dužine, s nekoliko skretanja da zaobiđe grupe otoka. Ova granica dijeli vremenske zone UTC+12 i UTC-12.
Prvi problem s datumskom granicom se uzrokovao kada je Magellan putovao oko Zemlje. Kako je njegova ekipa plovila po morima, čuvali su detaljne podatke o datumu. Ljudi na kopnu su uporno tvrdili da je bio drugi dan nego što je Magellan mislio. Iako je danas lako razumljiv, ovaj fenomen je uzbudio mnogo ljudi, i to čak toliko da je specijalna delegacija bila poslana papi da mu objasni ovo osebujnost.
http://hr.wikipedia.org/wiki/Međunarodna_datumska_granica