我正在阅读从Olson数据库生成的时区文件，以查找时区何时发生变化以及它们发生了什么变化。时区文件的格式在tzfile.h。
对于我的问题，我将使用我在欧洲/罗马获得的数据。
我可能让它正常工作，因为我的输出正确匹配timeanddate.com所说的内容。例如，我的程序正确地说：
1982年3月28日02:00:00，时区变为GMT +2.000000。
1982年9月26日03:00:00，时区变为GMT +1.000000。
这在此确认： http://www.timeanddate.com/worldclock/clockchange.html?n=215&year=1982
但是，我不确定是否需要使用tzh_ttisstdcnt和tzh_ttisgmtcnt。
来自tzfile.h：
然后有tzh_ttisstdcnt 标准/墙壁指示器，每个都存储 作为一个字节的值;他们告诉你是否 过渡时间相关联 指定了本地时间类型 作为标准时间或挂钟时间， 并在时区文件中使用 用于处理POSIX风格的时区 环境变量。
最后，还有tzh_ttisgmtcnt UTC /本地指标，每个都存储为 一个字节的值;他们告诉你是否 过渡时间相关联 与当地时间类型 指定为UTC或本地时间，和 在使用时区文件时使用 处理POSIX风格的时区 环境变量。
我发现每个“time-type”（ttinfo结构）都有一个isstd和isgmt字节。 这些是欧洲/罗马的6个“时间类型”：
Type 0, CEST, DST? = 1, GMT+2, isstd? = 1, isgmt? = 0 Type 1, CET, DST? = 0, GMT+1, isstd? = 1, isgmt? = 0 Type 2, CEST, DST? = 1, GMT+2, isstd? = 0, isgmt? = 0 Type 3, CET, DST? = 0, GMT+1, isstd? = 0, isgmt? = 0 Type 4, CEST, DST? = 1, GMT+2, isstd? = 1, isgmt? = 1 Type 5, CET, DST? = 0, GMT+1, isstd? = 1, isgmt? = 1
tzfile.h使其听起来像isstd，isgmt告诉您如何存储转换时间（gmt vs localtime）。但是，我的代码目前假设所有转换时间都存储为GMT。对于所有6种转换类型，我的程序输出匹配timeanddate.com。
另外，我不明白0和1类型可以是std而不是gmt。我认为GMT是标准时间。
任何解释都会很棒。
当忽略isstd和isgmt选项时，我的输出似乎几乎与timeanddate.com上的数据匹配。我目前正在将所有过渡时间解释为GMT：
罗马的过渡类型：
新类型0： isdst = 1 偏移= 7200 缩写= 0 isstd = 1 isgmt = 0
新类型1： isdst = 0 偏移= 3600 缩写= 5 isstd = 1 isgmt = 0
新型2： isdst = 1 偏移= 7200 缩写= 0 isstd = 0 isgmt = 0
新型3： isdst = 0 偏移= 3600 缩写= 5 isstd = 0 isgmt = 0
新型4： isdst = 1 偏移= 7200 缩写= 0 isstd = 1 isgmt = 1
罗马数据（假设所有过渡时间均以GMT形式给出）：
The starting timezone is GMT+1
type: 0, transition time in file:-1690851600
Add previous offset to get transition as (localtime): June 03, 1916 00:00:00 GMT+2
**type: 1, transition time in file:-1680483600
Add previous offset to get transition as (localtime): October 01, 1916 01:00:00 GMT+1**
type: 0, transition time in file:-1664758800
Add previous offset to get transition as (localtime): April 01, 1917 00:00:00 GMT+2
type: 1, transition time in file:-1649034000
Add previous offset to get transition as (localtime): September 30, 1917 01:00:00 GMT+1
type: 0, transition time in file:-1635123600
Add previous offset to get transition as (localtime): March 10, 1918 00:00:00 GMT+2
type: 1, transition time in file:-1616979600
Add previous offset to get transition as (localtime): October 06, 1918 01:00:00 GMT+1
type: 0, transition time in file:-1604278800
Add previous offset to get transition as (localtime): March 02, 1919 00:00:00 GMT+2
type: 1, transition time in file:-1585530000
Add previous offset to get transition as (localtime): October 05, 1919 01:00:00 GMT+1
type: 0, transition time in file:-1571014800
Add previous offset to get transition as (localtime): March 21, 1920 00:00:00 GMT+2
type: 1, transition time in file:-1555290000
Add previous offset to get transition as (localtime): September 19, 1920 01:00:00 GMT+1
type: 0, transition time in file:-932432400
Add previous offset to get transition as (localtime): June 15, 1940 00:00:00 GMT+2
type: 1, transition time in file:-857257200
Add previous offset to get transition as (localtime): November 02, 1942 03:00:00 GMT+1
type: 0, transition time in file:-844556400
Add previous offset to get transition as (localtime): March 29, 1943 02:00:00 GMT+2
type: 1, transition time in file:-828226800
Add previous offset to get transition as (localtime): October 04, 1943 03:00:00 GMT+1
type: 0, transition time in file:-812502000
Add previous offset to get transition as (localtime): April 03, 1944 02:00:00 GMT+2
type: 1, transition time in file:-798080400
Add previous offset to get transition as (localtime): September 17, 1944 01:00:00 GMT+1
type: 2, transition time in file:-781052400
Add previous offset to get transition as (localtime): April 02, 1945 02:00:00 GMT+2
type: 1, transition time in file:-766717200
Add previous offset to get transition as (localtime): September 15, 1945 01:00:00 GMT+1
type: 0, transition time in file:-750898800
Add previous offset to get transition as (localtime): March 17, 1946 02:00:00 GMT+2
type: 1, transition time in file:-733359600
Add previous offset to get transition as (localtime): October 06, 1946 03:00:00 GMT+1
type: 0, transition time in file:-719456400
Add previous offset to get transition as (localtime): March 16, 1947 00:00:00 GMT+2
type: 1, transition time in file:-701917200
Add previous offset to get transition as (localtime): October 05, 1947 01:00:00 GMT+1
type: 0, transition time in file:-689209200
Add previous offset to get transition as (localtime): February 29, 1948 02:00:00 GMT+2
type: 1, transition time in file:-670460400
Add previous offset to get transition as (localtime): October 03, 1948 03:00:00 GMT+1
type: 2, transition time in file:-114051600
Add previous offset to get transition as (localtime): May 22, 1966 00:00:00 GMT+2
type: 3, transition time in file:-103168800
Add previous offset to get transition as (localtime): September 25, 1966 00:00:00 GMT+1
type: 2, transition time in file:-81997200
Add previous offset to get transition as (localtime): May 28, 1967 00:00:00 GMT+2
type: 3, transition time in file:-71719200
Add previous offset to get transition as (localtime): September 24, 1967 00:00:00 GMT+1
type: 2, transition time in file:-50547600
Add previous offset to get transition as (localtime): May 26, 1968 00:00:00 GMT+2
type: 3, transition time in file:-40269600
Add previous offset to get transition as (localtime): September 22, 1968 00:00:00 GMT+1
type: 2, transition time in file:-18493200
Add previous offset to get transition as (localtime): June 01, 1969 00:00:00 GMT+2
type: 3, transition time in file:-8215200
Add previous offset to get transition as (localtime): September 28, 1969 00:00:00 GMT+1
type: 2, transition time in file:12956400
Add previous offset to get transition as (localtime): May 31, 1970 00:00:00 GMT+2
type: 3, transition time in file:23234400
Add previous offset to get transition as (localtime): September 27, 1970 00:00:00 GMT+1
type: 2, transition time in file:43801200
Add previous offset to get transition as (localtime): May 23, 1971 00:00:00 GMT+2
type: 3, transition time in file:54687600
Add previous offset to get transition as (localtime): September 26, 1971 01:00:00 GMT+1
type: 2, transition time in file:75855600
Add previous offset to get transition as (localtime): May 28, 1972 00:00:00 GMT+2
type: 3, transition time in file:86738400
Add previous offset to get transition as (localtime): October 01, 1972 00:00:00 GMT+1
type: 2, transition time in file:107910000
Add previous offset to get transition as (localtime): June 03, 1973 00:00:00 GMT+2
type: 3, transition time in file:118188000
Add previous offset to get transition as (localtime): September 30, 1973 00:00:00 GMT+1
type: 2, transition time in file:138754800
Add previous offset to get transition as (localtime): May 26, 1974 00:00:00 GMT+2
type: 3, transition time in file:149637600
Add previous offset to get transition as (localtime): September 29, 1974 00:00:00 GMT+1
type: 0, transition time in file:170809200
Add previous offset to get transition as (localtime): June 01, 1975 00:00:00 GMT+2
type: 1, transition time in file:181090800
Add previous offset to get transition as (localtime): September 28, 1975 01:00:00 GMT+1
type: 0, transition time in file:202258800
Add previous offset to get transition as (localtime): May 30, 1976 00:00:00 GMT+2
type: 1, transition time in file:212540400
Add previous offset to get transition as (localtime): September 26, 1976 01:00:00 GMT+1
type: 0, transition time in file:233103600
Add previous offset to get transition as (localtime): May 22, 1977 00:00:00 GMT+2
type: 1, transition time in file:243990000
Add previous offset to get transition as (localtime): September 25, 1977 01:00:00 GMT+1
type: 0, transition time in file:265158000
Add previous offset to get transition as (localtime): May 28, 1978 00:00:00 GMT+2
type: 1, transition time in file:276044400
Add previous offset to get transition as (localtime): October 01, 1978 01:00:00 GMT+1
type: 0, transition time in file:296607600
Add previous offset to get transition as (localtime): May 27, 1979 00:00:00 GMT+2
type: 1, transition time in file:307494000
Add previous offset to get transition as (localtime): September 30, 1979 01:00:00 GMT+1
type: 4, transition time in file:323830800
Add previous offset to get transition as (localtime): April 06, 1980 02:00:00 GMT+2
type: 5, transition time in file:338950800
Add previous offset to get transition as (localtime): September 28, 1980 03:00:00 GMT+1
type: 4, transition time in file:354675600
Add previous offset to get transition as (localtime): March 29, 1981 02:00:00 GMT+2
type: 5, transition time in file:370400400
Add previous offset to get transition as (localtime): September 27, 1981 03:00:00 GMT+1
type: 4, transition time in file:386125200
Add previous offset to get transition as (localtime): March 28, 1982 02:00:00 GMT+2
type: 5, transition time in file:401850000
Add previous offset to get transition as (localtime): September 26, 1982 03:00:00 GMT+1
type: 4, transition time in file:417574800
Add previous offset to get transition as (localtime): March 27, 1983 02:00:00 GMT+2
type: 5, transition time in file:433299600
Add previous offset to get transition as (localtime): September 25, 1983 03:00:00 GMT+1
type: 4, transition time in file:449024400
Add previous offset to get transition as (localtime): March 25, 1984 02:00:00 GMT+2
type: 5, transition time in file:465354000
Add previous offset to get transition as (localtime): September 30, 1984 03:00:00 GMT+1
type: 4, transition time in file:481078800
Add previous offset to get transition as (localtime): March 31, 1985 02:00:00 GMT+2
type: 5, transition time in file:496803600
Add previous offset to get transition as (localtime): September 29, 1985 03:00:00 GMT+1
type: 4, transition time in file:512528400
Add previous offset to get transition as (localtime): March 30, 1986 02:00:00 GMT+2
type: 5, transition time in file:528253200
Add previous offset to get transition as (localtime): September 28, 1986 03:00:00 GMT+1
type: 4, transition time in file:543978000
Add previous offset to get transition as (localtime): March 29, 1987 02:00:00 GMT+2
type: 5, transition time in file:559702800
Add previous offset to get transition as (localtime): September 27, 1987 03:00:00 GMT+1
type: 4, transition time in file:575427600
Add previous offset to get transition as (localtime): March 27, 1988 02:00:00 GMT+2
type: 5, transition time in file:591152400
Add previous offset to get transition as (localtime): September 25, 1988 03:00:00 GMT+1
type: 4, transition time in file:606877200
Add previous offset to get transition as (localtime): March 26, 1989 02:00:00 GMT+2
type: 5, transition time in file:622602000
Add previous offset to get transition as (localtime): September 24, 1989 03:00:00 GMT+1
type: 4, transition time in file:638326800
Add previous offset to get transition as (localtime): March 25, 1990 02:00:00 GMT+2
type: 5, transition time in file:654656400
Add previous offset to get transition as (localtime): September 30, 1990 03:00:00 GMT+1
type: 4, transition time in file:670381200
Add previous offset to get transition as (localtime): March 31, 1991 02:00:00 GMT+2
type: 5, transition time in file:686106000
Add previous offset to get transition as (localtime): September 29, 1991 03:00:00 GMT+1
type: 4, transition time in file:701830800
Add previous offset to get transition as (localtime): March 29, 1992 02:00:00 GMT+2
type: 5, transition time in file:717555600
Add previous offset to get transition as (localtime): September 27, 1992 03:00:00 GMT+1
type: 4, transition time in file:733280400
Add previous offset to get transition as (localtime): March 28, 1993 02:00:00 GMT+2
type: 5, transition time in file:749005200
Add previous offset to get transition as (localtime): September 26, 1993 03:00:00 GMT+1
type: 4, transition time in file:764730000
Add previous offset to get transition as (localtime): March 27, 1994 02:00:00 GMT+2
type: 5, transition time in file:780454800
Add previous offset to get transition as (localtime): September 25, 1994 03:00:00 GMT+1
type: 4, transition time in file:796179600
Add previous offset to get transition as (localtime): March 26, 1995 02:00:00 GMT+2
type: 5, transition time in file:811904400
Add previous offset to get transition as (localtime): September 24, 1995 03:00:00 GMT+1
type: 4, transition time in file:828234000
Add previous offset to get transition as (localtime): March 31, 1996 02:00:00 GMT+2
type: 5, transition time in file:846378000
Add previous offset to get transition as (localtime): October 27, 1996 03:00:00 GMT+1
type: 4, transition time in file:859683600
Add previous offset to get transition as (localtime): March 30, 1997 02:00:00 GMT+2
type: 5, transition time in file:877827600
Add previous offset to get transition as (localtime): October 26, 1997 03:00:00 GMT+1
type: 4, transition time in file:891133200
Add previous offset to get transition as (localtime): March 29, 1998 02:00:00 GMT+2
type: 5, transition time in file:909277200
Add previous offset to get transition as (localtime): October 25, 1998 03:00:00 GMT+1
type: 4, transition time in file:922582800
Add previous offset to get transition as (localtime): March 28, 1999 02:00:00 GMT+2
type: 5, transition time in file:941331600
Add previous offset to get transition as (localtime): October 31, 1999 03:00:00 GMT+1
type: 4, transition time in file:954032400
Add previous offset to get transition as (localtime): March 26, 2000 02:00:00 GMT+2
type: 5, transition time in file:972781200
Add previous offset to get transition as (localtime): October 29, 2000 03:00:00 GMT+1
type: 4, transition time in file:985482000
Add previous offset to get transition as (localtime): March 25, 2001 02:00:00 GMT+2
type: 5, transition time in file:1004230800
Add previous offset to get transition as (localtime): October 28, 2001 03:00:00 GMT+1
type: 4, transition time in file:1017536400
Add previous offset to get transition as (localtime): March 31, 2002 02:00:00 GMT+2
type: 5, transition time in file:1035680400
Add previous offset to get transition as (localtime): October 27, 2002 03:00:00 GMT+1
type: 4, transition time in file:1048986000
Add previous offset to get transition as (localtime): March 30, 2003 02:00:00 GMT+2
type: 5, transition time in file:1067130000
Add previous offset to get transition as (localtime): October 26, 2003 03:00:00 GMT+1
type: 4, transition time in file:1080435600
Add previous offset to get transition as (localtime): March 28, 2004 02:00:00 GMT+2
type: 5, transition time in file:1099184400
Add previous offset to get transition as (localtime): October 31, 2004 03:00:00 GMT+1
type: 4, transition time in file:1111885200
Add previous offset to get transition as (localtime): March 27, 2005 02:00:00 GMT+2
type: 5, transition time in file:1130634000
Add previous offset to get transition as (localtime): October 30, 2005 03:00:00 GMT+1
type: 4, transition time in file:1143334800
Add previous offset to get transition as (localtime): March 26, 2006 02:00:00 GMT+2
type: 5, transition time in file:1162083600
Add previous offset to get transition as (localtime): October 29, 2006 03:00:00 GMT+1
type: 4, transition time in file:1174784400
Add previous offset to get transition as (localtime): March 25, 2007 02:00:00 GMT+2
type: 5, transition time in file:1193533200
Add previous offset to get transition as (localtime): October 28, 2007 03:00:00 GMT+1
type: 4, transition time in file:1206838800
Add previous offset to get transition as (localtime): March 30, 2008 02:00:00 GMT+2
type: 5, transition time in file:1224982800
Add previous offset to get transition as (localtime): October 26, 2008 03:00:00 GMT+1
type: 4, transition time in file:1238288400
Add previous offset to get transition as (localtime): March 29, 2009 02:00:00 GMT+2
type: 5, transition time in file:1256432400
Add previous offset to get transition as (localtime): October 25, 2009 03:00:00 GMT+1
type: 4, transition time in file:1269738000
Add previous offset to get transition as (localtime): March 28, 2010 02:00:00 GMT+2
type: 5, transition time in file:1288486800
Add previous offset to get transition as (localtime): October 31, 2010 03:00:00 GMT+1
type: 4, transition time in file:1301187600
Add previous offset to get transition as (localtime): March 27, 2011 02:00:00 GMT+2
type: 5, transition time in file:1319936400
Add previous offset to get transition as (localtime): October 30, 2011 03:00:00 GMT+1
type: 4, transition time in file:1332637200
Add previous offset to get transition as (localtime): March 25, 2012 02:00:00 GMT+2
type: 5, transition time in file:1351386000
Add previous offset to get transition as (localtime): October 28, 2012 03:00:00 GMT+1
type: 4, transition time in file:1364691600
Add previous offset to get transition as (localtime): March 31, 2013 02:00:00 GMT+2
type: 5, transition time in file:1382835600
Add previous offset to get transition as (localtime): October 27, 2013 03:00:00 GMT+1
type: 4, transition time in file:1396141200
Add previous offset to get transition as (localtime): March 30, 2014 02:00:00 GMT+2
type: 5, transition time in file:1414285200
Add previous offset to get transition as (localtime): October 26, 2014 03:00:00 GMT+1
type: 4, transition time in file:1427590800
Add previous offset to get transition as (localtime): March 29, 2015 02:00:00 GMT+2
type: 5, transition time in file:1445734800
Add previous offset to get transition as (localtime): October 25, 2015 03:00:00 GMT+1
type: 4, transition time in file:1459040400
Add previous offset to get transition as (localtime): March 27, 2016 02:00:00 GMT+2
type: 5, transition time in file:1477789200
Add previous offset to get transition as (localtime): October 30, 2016 03:00:00 GMT+1
type: 4, transition time in file:1490490000
Add previous offset to get transition as (localtime): March 26, 2017 02:00:00 GMT+2
type: 5, transition time in file:1509238800
Add previous offset to get transition as (localtime): October 29, 2017 03:00:00 GMT+1
type: 4, transition time in file:1521939600
Add previous offset to get transition as (localtime): March 25, 2018 02:00:00 GMT+2
type: 5, transition time in file:1540688400
Add previous offset to get transition as (localtime): October 28, 2018 03:00:00 GMT+1
type: 4, transition time in file:1553994000
Add previous offset to get transition as (localtime): March 31, 2019 02:00:00 GMT+2
type: 5, transition time in file:1572138000
Add previous offset to get transition as (localtime): October 27, 2019 03:00:00 GMT+1
type: 4, transition time in file:1585443600
Add previous offset to get transition as (localtime): March 29, 2020 02:00:00 GMT+2
type: 5, transition time in file:1603587600
Add previous offset to get transition as (localtime): October 25, 2020 03:00:00 GMT+1
type: 4, transition time in file:1616893200
Add previous offset to get transition as (localtime): March 28, 2021 02:00:00 GMT+2
type: 5, transition time in file:1635642000
Add previous offset to get transition as (localtime): October 31, 2021 03:00:00 GMT+1
type: 4, transition time in file:1648342800
Add previous offset to get transition as (localtime): March 27, 2022 02:00:00 GMT+2
type: 5, transition time in file:1667091600
Add previous offset to get transition as (localtime): October 30, 2022 03:00:00 GMT+1
type: 4, transition time in file:1679792400
Add previous offset to get transition as (localtime): March 26, 2023 02:00:00 GMT+2
type: 5, transition time in file:1698541200
Add previous offset to get transition as (localtime): October 29, 2023 03:00:00 GMT+1
type: 4, transition time in file:1711846800
Add previous offset to get transition as (localtime): March 31, 2024 02:00:00 GMT+2
type: 5, transition time in file:1729990800
Add previous offset to get transition as (localtime): October 27, 2024 03:00:00 GMT+1
type: 4, transition time in file:1743296400
Add previous offset to get transition as (localtime): March 30, 2025 02:00:00 GMT+2
type: 5, transition time in file:1761440400
Add previous offset to get transition as (localtime): October 26, 2025 03:00:00 GMT+1
type: 4, transition time in file:1774746000
Add previous offset to get transition as (localtime): March 29, 2026 02:00:00 GMT+2
type: 5, transition time in file:1792890000
Add previous offset to get transition as (localtime): October 25, 2026 03:00:00 GMT+1
type: 4, transition time in file:1806195600
Add previous offset to get transition as (localtime): March 28, 2027 02:00:00 GMT+2
type: 5, transition time in file:1824944400
Add previous offset to get transition as (localtime): October 31, 2027 03:00:00 GMT+1
type: 4, transition time in file:1837645200
Add previous offset to get transition as (localtime): March 26, 2028 02:00:00 GMT+2
type: 5, transition time in file:1856394000
Add previous offset to get transition as (localtime): October 29, 2028 03:00:00 GMT+1
type: 4, transition time in file:1869094800
Add previous offset to get transition as (localtime): March 25, 2029 02:00:00 GMT+2
type: 5, transition time in file:1887843600
Add previous offset to get transition as (localtime): October 28, 2029 03:00:00 GMT+1
type: 4, transition time in file:1901149200
Add previous offset to get transition as (localtime): March 31, 2030 02:00:00 GMT+2
type: 5, transition time in file:1919293200
Add previous offset to get transition as (localtime): October 27, 2030 03:00:00 GMT+1
type: 4, transition time in file:1932598800
Add previous offset to get transition as (localtime): March 30, 2031 02:00:00 GMT+2
type: 5, transition time in file:1950742800
Add previous offset to get transition as (localtime): October 26, 2031 03:00:00 GMT+1
type: 4, transition time in file:1964048400
Add previous offset to get transition as (localtime): March 28, 2032 02:00:00 GMT+2
type: 5, transition time in file:1982797200
Add previous offset to get transition as (localtime): October 31, 2032 03:00:00 GMT+1
type: 4, transition time in file:1995498000
Add previous offset to get transition as (localtime): March 27, 2033 02:00:00 GMT+2
type: 5, transition time in file:2014246800
Add previous offset to get transition as (localtime): October 30, 2033 03:00:00 GMT+1
type: 4, transition time in file:2026947600
Add previous offset to get transition as (localtime): March 26, 2034 02:00:00 GMT+2
type: 5, transition time in file:2045696400
Add previous offset to get transition as (localtime): October 29, 2034 03:00:00 GMT+1
type: 4, transition time in file:2058397200
Add previous offset to get transition as (localtime): March 25, 2035 02:00:00 GMT+2
type: 5, transition time in file:2077146000
Add previous offset to get transition as (localtime): October 28, 2035 03:00:00 GMT+1
type: 4, transition time in file:2090451600
Add previous offset to get transition as (localtime): March 30, 2036 02:00:00 GMT+2
type: 5, transition time in file:2108595600
Add previous offset to get transition as (localtime): October 26, 2036 03:00:00 GMT+1
type: 4, transition time in file:2121901200
Add previous offset to get transition as (localtime): March 29, 2037 02:00:00 GMT+2
type: 5, transition time in file:2140045200
Add previous offset to get transition as (localtime): October 25, 2037 03:00:00 GMT+1
我的第2和第4次转换比列出的here晚一个小时，但几乎所有其他内容都匹配。
答案 0 :(得分：3)
'标准时间'是指'冬令时'，而不是'夏令时'或'夏令时'。是的，GMT（松散地，严格地说，UTC）是“时间标准”，但它与数据中“isstd”列引用的内容并不完全相同。
关于'isstd'为0或1的观点是欧洲的转换时间（通常）指定在当前时区的02:00进行。
因此，欧洲/罗马的时钟去了：
1982-03-28 01:59:59 (UTC+01:00)
1982-03-28 03:00:00 (UTC+02:00)
记录此转换发生在02:00标准时间（isstd = 1），但这不是UTC（GMT）时间;因此，它是您列表中的Type 0转换。相反，在秋天，时钟去了：
1982-09-26 01:59:59 (UTC+02:00)
1982-09-26 01:00:00 (UTC+01:00)
记录转换发生在切换前的时区02:00，所以isstd = 0（但不是UTC（GMT）时间）;因此，这是您列表中的类型3转换。
其他组合（类型1,2,4,5）出现在其他情况下。对于相同的两个转换，您将使用类型4条目并将更改时间记录为01:00 UTC（因为01：00：00 + 00:00与02：00：00 + 01:00相同;并且您将使用类型5条目并将更改时间记录为00:00 UTC（因为00：00：00 + 00:00与02：00：00 + 02:00相同）。请注意此处的切换时间彼此不同。描述中的类似差异适用于类型1和类型。
答案 1 :(得分：0)
我打算编辑我原来的帖子，但它说它太长了：
我认为我的数据是正确的，TimeAndDate.com有一个小错误。
对于我的测试，我专注于罗马的前两个过渡。
我的数据是：
输入：0，过渡时间 文件：-1690851600
添加上一个偏移量 获得当地过渡时间：6月03日， 1916 00:00:00新时区是GMT + 2
类型：1，过渡时间 文件：-1680483600
添加上一个偏移量 获得当地过渡时间：十月 01,1916 01:00:00新时区是 GMT + 1
TimeAndDate的数据显示：
1。）1916年6月3日星期六，晚上11:59:59
1916年6月4日星期日12:00:00午夜 →上午1:00:00 + 1小时UTC + 2小时CEST DST 开始
2。）1916年9月30日星期六11:59:59 PM
12:00:00午夜→11：00：00 PM否UTC + 1h CET DST结束
我将计算机的时区和当地时间设置为匹配罗马。 然后，我运行了以下代码：
time_t rome_ts;
struct tm * rome_info;
char rome_buffer[75];
printf("My first transition:\n");
rome_ts = -1690851601;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n");
rome_ts = -1690851600;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n");
rome_ts = -1690851599;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n\n\n");
printf("TimeandDate.com's first transition:\n");
rome_ts = -1690768801;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n");
rome_ts = -1690768800;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n");
rome_ts = -1690768799;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n\n\n");
printf("My second transition:\n");
rome_ts = -1680483601;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n");
rome_ts = -1680483600;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n");
rome_ts = -1680483599;
rome_info = localtime(&rome_ts);
printf("Timestamp: %ld\n",rome_ts);
strftime(rome_buffer,75,"%A %B %d, %Y %H:%M:%S %Z",rome_info);
printf("%s, dst? = %d\n",rome_buffer,rome_info->tm_isdst);
printf("\n\n\n");
输出显示localtime（）同意我的转换时间：
我的第一次转换：时间戳：
-1690851601 1916年6月2日星期五23:59:59 CET，dst？ = 0
时间戳：-1690851600 6月6日星期六 03,1916 01:00:00 CEST，dst？ = 1
时间戳：-1690851599 6月6日星期六 03,1916 01:00:01 CEST，dst？ = 1
TimeandDate.com的第一次转型：
时间戳：-1690768801星期六六月 03,1916 23:59:59 CEST，dst？ = 1
时间戳：-1690768800 6月4日星期日， 1916 00:00:00 CEST，dst？ = 1
时间戳：-1690768799 6月4日星期日， 1916 00:00:01 CEST，dst？ = 1
我的第二个转变：时间戳：
-1680483601 1916年10月1日星期日00:59:59 CEST，dst？ = 1
时间戳：-1680483600星期日10月 01,1916 00:00:00 CET，dst？ = 0
时间戳：-1680483599星期日10月 01,1916 00:00:01 CET，dst？ = 0