タイムゾーンの基礎教養/swamp of timezone

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ϰΝϧݚڀॴ"1*1MBUGPSN5FBN ۽໺૖ਅ !LVNBUJSB λΠϜκʔϯͷ جૅڭཆ

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ࣗݾ঺հ ۽໺૖ਅ ͘·ͷ ͦ͏· !LVNBUJSB LVNBUJSBCMPH • ϰΝϧݚڀॴ೥ೖࣾ ◦ "1*1MBUGPSN5FBNॴଐ ◦ ։ൃɾӡ༻ɾαϙʔτɾ޿ใ • झຯɿ஍ཧ ஍ਤ஍ཧݕఆڃ ཱྀߦ

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ࣗݾ঺հ ϓϩϘϊ΋΍ͬͯ·͢ גࣜձࣾϐϦΧ ʮՊֶٕज़ͷྗͰ͋ΒΏΔ ؀ڥ໰୊Λࠀ෰͢Δʯ

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ΤϯδχΞͷօ͞Μ

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͍ͭʹ

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αϚʔλΠϜΛ

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ଧͪࡅ͖·ͨ͠ ೔ຊܦࡁ৽ฉʮࣗຽɺޒྠ࣌ͷαϚʔλΠϜஅ೦ʯ೥݄೔෇ேץ

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͑ͬ

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αϚʔλΠϜΛ஌Βͳ͍

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ͦΜͳਓ͸

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ͺͨͦ͘͞Μͷ ը૾Λ΋ͱʹ࡞ͬͨ ஶ࡞ݖతʹਖ਼͍͠ ΩϞʔΠΨʔϧζ

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λΠϜκʔϯ

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࣌ࠩ

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αϚʔλΠϜʹ͍ͭͯ

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෮श͠Α͏

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೔ຊͷλΠϜκʔϯ͸ ͦ΋ͦ΋

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೔ຊඪ४࣌ˠੈքͷඪ४࣌65$͔Β ࣌ؒਐΜͰ͍Δ

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೔ຊඪ४࣌ˠ65$

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65$ʹ͸ ؖࠃɺϩγΞ Ұ෦ ɺΠϯυωγΞ Ұ෦ ͳͲ

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Ͱ͸

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࣌ࠩΛදࣔ͢Δ ϓϩάϥϜΛ࡞Δ࣌ɾɾɾ ྫ͑͹

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࣌ࠩΛ࣌ؒ୯ҐͰදݱͰ͖Ε͹ 0,ͩΑͶ l̋̋ࠃͱ99ࠃͷ࣌ࠩ͸\UJNF@EJ⒎FSFODF^࣌ؒͩΑz

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ͦΜͳਓ͸

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ΦʔετϥϦΞத෦ඪ४࣌ ΞσϨʔυͳͲ 65$ ωύʔϧඪ४࣌ 65$ ΠϯυͷϜϯόΠ ೥·Ͱ 65$ μϝͰ͢

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͡Ό͋ɾɾɾ

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࣌ࠩ෼୯ҐΛදݱͰ͖Ε͹ 0, ͜͜·Ͱ͸૝ఆ಺

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ͦΜͳਓ͸

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μϒϦϯฏۉ࣌ ɹɹɹ65$ ΞΠϧϥϯυ ೥·Ͱ l*O*SFMBOErXIFSFUIFTVO BTNFBTVSFECZUIF%VOTJOL 0CTFSWBUPSZ SPTFNJOVUFTBOETFDPOETMBUFSUIBOBU (SFFOXJDIrUJNFXBTP⒏DJBMMZEFpOFEBT%VCMJO.FBO5JNFzɹɹɹɹɹ 5IF*SJTI5JNFTͷهࣄΑΓ μϝͰ͢

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μϒϦϯฏۉ࣌ ΞΠϧϥϯυ ೥·Ͱ 65$ ϞϯϩϏΞඪ४࣌ ϦϕϦΞ ೥·Ͱ 65$ Ϡϯΰϯඪ४࣌ ϛϟϯϚʔ ೥·Ͱ 65$ μϝͰ͢

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͓खݩͷ04΋ ରԠͣΈͰ͢ 6/*9ͳͲͰར༻͞ΕΔ U[EBUBCBTFͷμϒϦϯ࣌ؒ

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ྺ࢙తͳΠϕϯτ ͷ࣌ࠁΛࢀর͢Δ࣌͸ඞཁ

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͡Ό͋ɾɾɾ

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࣌ࠩඵ୯ҐΛදݱͰ͖Ε͹ 0,

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Ξϧθϯνϯඪ४࣌ ೥·Ͱ 65$ Ϛυϥεৗ༻࣌ Πϯυ ೥·Ͱ 65$ ΞϜεςϧμϜඪ४࣌ Φϥϯμ ೥·Ͱ 65$ μϝͰ͢

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U[UJNF[POFͰ͸ɺ ٞ࿦͕͞Ε͍ͯΔ͕ ରԠ͍ͯ͠ͳ͍

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ඵҎԼͷਫ਼౓͕ٻΊΒΕΔ࣌͸ඞཁ ఱจֶͱ͔

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λΠϜκʔϯͷϠό͕͞ Θ͔ͬͨͱ͜ΖͰ

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αϚʔλΠϜͬͯ Ͱ͸·ͣ

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αϚʔλΠϜͬͯ Նͷؒɺඪ४࣌ΛਐΊΔ͜ͱͰɺ ೔ޫͷग़͍ͯΔ࣌ؒΛ༗ޮ׆༻͢Δ੍౓ Ͱ͸·ͣ

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IUUQTXXXOJLLFJDPNBSUJDMF%(9.;08"$ ೔ຊͰ΋

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ਐΊΔͱ͖ य़ ͸ ˠ ໭͢ͱ͖ ळ ͸ ˠ ྫ͑͹

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Կ͕΍͹͍ͷ͔

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࣮͸ฐࣾ ϰΝϧݚڀॴ ͸ ܦ࿏୳ࡧαʔϏεʮӺ͢ͺ͋ͱʯ Λ࡞͍ͬͯ·͢

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ߴԁࣉൃ ˣ ॴཁ࣌ؒ෼ ˣ Ѩࠤϲ୩ண Έ͍ͨͳྻं͕ര஀͢Δ य़ʹ͸

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ؔ੢ۭߓൃ ˣ ॴཁ࣌ؒ෼ ˣ ͳΜ͹Ӻલண Έ͍ͨͳόε͕ര஀͢Δ ळʹ͸

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ؔ੢ۭߓൃ ˣ ॴཁ࣌ؒ෼ ˣ ͳΜ͹Ӻલண Έ͍ͨͳόε͕ര஀͢Δ ळʹ͸ ͜ͷޙ ճ໨ͷ ͕ ൃੜ͢Δ

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࣌ࠁ͸୯७૿Ճͳ΋ͷ ͱ࣮ͯ͠૷͍ͯ͠Δͱɾɾɾ %#ͷλΠϜελϯϓͱ͔

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͡Ό͋ɾɾɾ

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αϚʔλΠϜ࣮ࢪ࣌ʹ ࣌ؒਐΉPS໭ΔΑ͏ʹ ͢Ε͹0,

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࣌ؒͱ͸ݶΒͳ͍ ΦʔετϥϦΞͷϩʔυɾϋ΢ౡͰ͸෼ਐΊΔ ೥݄೔ˠ೥݄೔ IUUQTKBXJLJQFEJBPSHXJLJϩʔυɾϋ΢ౡ

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࣌ؒͱ͸ݶΒͳ͍ ೆۃͷτϩϧج஍ ϊϧ΢Σʔ Ͱ͸࣌ؒਐΊΔ ೥݄೔ˠ೥݄೔ IUUQTFOXJLJQFEJBPSHXJLJ5SPMM@ SFTFBSDI@TUBUJPO

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IUUQTXXXBTBIJDPNBSUJDMFT"4-89;-86521/IUNM ࣌ؒͱ͸ݶΒͳ͍ զ͕ࠃ΋࣌ؒͰ ݕ౼͍ͯͨ͠Β͍͠

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͡Ό͋ɾɾɾ

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ͱΓ͋͑ͣαϚʔλΠϜͷPOP⒎ Λ੾Γସ͑Ε͹0, ࣌ࠁͷೖྗϑΥʔϜͱ͔

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ӳࠃೋॏՆ࣌ؒ ೥ʙ೥ ௨೥ͰαϚʔλΠϜ 65$ Λ࣮ࢪ্ͨ͠Ͱ ɹɹՆقʹ͞ΒʹαϚʔλΠϜ 65$ Λ࣮ࢪ ೥ ݄ʙ݄Λʮय़ɾळ࣌ؒʯ 65$ ͱ্ͨ͠Ͱ ݄ʙ݄ʹαϚʔλΠϜ 65$ Λ࣮ࢪ μϝͰ͢

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͜Ε͙Β͍ʹ͠ͱ͖·͢

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• ࠃ಺ʹෳ਺ͷλΠϜκʔϯ • λΠϜκʔϯҠߦͰؙ೔ͬ͢ඈ͹ͨ͠ࠃ • ඇެࣜͳλΠϜκʔϯ ͦͷଞʹ΋