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[[Image:DaylightSaving-World-Subdivisions.png|thumb|256px|
{{legend|#1a80e6|leh si̍t-hêng joa̍hhā-tang sî-kan}}
{{legend|#ef690a|bat si̍t-hêng joa̍hhā-tang sî-kan}}
{{legend|#c00000|m̄-bat si̍t-hêng joa̍hhā-tang sî-kan}}]]
'''Joa̍hHā-tangsî-kan''' (夏時間, {{lang-en|summer time}}), '''joa̍h-thiⁿ sî-kan''', ia̍h '''hā-lēng sî-kan''' (夏令時間), mā hō chò '''ji̍t-thaûthâu-kng khiām-iok sî-kan''' (日頭光儉約時間, {{lang-en|daylight saving time}}), sī tī [[Ji̍t-thaûthâu]] khah chá chhut--lâi hit kúi goe̍h kā chāi-tē ê [[piau-chún sî-kan]] tiâu chìn-chêng, pí-lūn kóng kā sî-kè tiâu kín 1 tiám-chéng. Án-ne, ē-tit khah tah-té lī-iōng ji̍t-thaûthâu-kng, khiām-iok [[lêng-goân]].
[[Tâi-oân]] tī 1945 kaùnî kàu 1961 nî, 1974 nî, 1975 nî lóng ū si̍t-hêng joa̍hhā-tang sî-kan.
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