我正在读取从Olson数据库生成的时区文件,以查找时区何时更改以及更改的内容.时区文件的格式如下所述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.
这在此处得到确认: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/墙指示符,每个指标存储为一个字节的值; 它们指示与本地时间类型关联的转换时间是否指定为标准时间或挂钟时间,并在时区文件用于处理POSIX样式的时区环境变量时使用.
最后,有tzh_ttisgmtcnt UTC /本地指标,每个指标都存储为一个字节的值; 它们指示与本地时间类型关联的转换时间是否指定为UTC或本地时间,并在时区文件用于处理POSIX样式的时区环境变量时使用.
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":
Run Code Online (Sandbox Code Playgroud)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使它听起来像isstd和isgmt告诉你如何存储转换时间(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,我的程序输出与timeanddate.com相匹配.
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.
看来,我的输出上的数据几乎与timeanddate.com当我忽略isstd和isgmt选项.我目前正在将所有过渡时间解释为GMT:
罗马的过渡类型:
new type 0:isdst = 1 offset = 7200 abbreviation = 0 isstd = 1 isgmt = 0
新类型1:isdst = 0 offset = 3600 abbreviation = 5 isstd = 1 isgmt = 0
new type 2:isdst = 1 offset = 7200 abbreviation = 0 isstd = 0 isgmt = 0
新类型3:isdst = 0 offset = 3600 abbreviation = 5 isstd = 0 isgmt = 0
新类型4:isdst = 1 offset = 7200 abbreviation = 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次转换比这里列出的转换晚了一个小时,但几乎所有其他内容看起来都匹配.
“标准时间”是指“冬令时”，而不是“夏令时”或“夏令时”。是的，GMT（宽松地；严格地，UTC）是“时间标准”，但它与数据中“isstd”列所指的内容并不完全相同。
关于“isstd”为 0 或 1 的一点是，欧洲的过渡时间（通常）指定为当前时区的 02:00。
因此，欧洲/罗马的时钟为：
1982-03-28 01:59:59 (UTC+01:00)
1982-03-28 03:00:00 (UTC+02:00)
据记录，此转换发生在 02:00 标准时间 (so isstd = 1)，但这不是 UTC (GMT) 时间；因此它是列表中的 0 型转换。相反，在秋天，时钟走的是：
1982-09-26 01:59:59 (UTC+02:00)
1982-09-26 01:00:00 (UTC+01:00)
据记录，转换发生在转换之前的时区 02:00，因此isstd = 0（但这不是 UTC (GMT) 时间）；因此，它是您列表中的类型 3 转换。
其他组合（类型1、2、4、5）出现在其他情况下。对于同样的两个转换，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；并且您可以使用类型 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。描述中的类似差异也适用于类型 1 和 2。