jbe*_*ock 13 sql-server datetime utc
我正在面对一个SQL Server数据库,它包含许多DateTime以本地时间存储的值.(是的,这是不幸的!)我们可能有5到10年的数据,这意味着如果相关区域遵守夏令时,当然还有时间表,这个位置的UTC偏移将根据一年中的时间而变化发生这种变化的情况也可能发生变化,例如它在2007年发生在美国(这些数据大部分起源于此)的情况.
我的目标是DateTime在SQL级别将这些s 转换为UTC时间.如果没有加载整个Olson或TZ数据库并查询它,有没有人有一种技术可以将历史本地时间戳转换为UTC时间？[如果它有帮助,方便的话,我们碰巧也有每行的纬度和经度(可用于识别时区.)
注意:对于实时写入的行DATEDIFF(Hour, Getutcdate(), GETDATE()) AS UtcOffset,当然可以正常工作.问题是将此追溯应用于夏令时"屏障"两侧发生的日期.
小智 0
这是基于 Chris Barlow 之前的回答，位于
这是一个 SQL Server 2008 视图形式的解决方案组件，其中包括用于历史数据转换的夏令时 (DST) 规则方法。
（不需要纬度/经度数据。）
您可以使用此视图创建自定义解决方案，引用更新、可能需要转换的本地表列，例如 dbo.mytable.created_date。
下面引用了有关使用视图的一些注意事项，感兴趣的是“示例用法 - 用于历史数据转换”部分：
--
-- DATETIME VS. DATETIMEOFFSET
--
-- WHERE, t = '2016-12-13 04:32:00'
--
declare
@Sydney DATETIME
set
@Sydney = '2016-12-13 04:32:00'
select
Sydney = @Sydney
declare
@Sydney_UTC DATETIMEOFFSET
set
@Sydney_UTC = '2016-12-13 04:32:00.6427663 +10:00'
select
Sydney_UTC = @Sydney_UTC
declare
@NewYork DATETIME
set
@NewYork = '2016-12-13 04:32:00:34'
select
NewYork = @NewYork
declare
@NewYork_UTC DATETIMEOFFSET
set
@NewYork_UTC = '2016-12-13 04:32:00.6427663 -04:00'
select
NewYork_UTC = @NewYork_UTC
select
DATEDIFF(hh, @Sydney, @NewYork) as DIFF_DATETIME
select
DATEDIFF(hh, @Sydney_UTC, @NewYork_UTC) as DIFF_DATETIMEOFFSET
--
-- LOCAL UTC OFFSET FOR REAL-TIME DATA TODAY
--
select
DATEDIFF( Hour, GETUTCDATE(), GETDATE() ) AS UtcOffset
--
-- LOCAL UTC DATE FOR REAL-TIME DATA TODAY - EASTERN STANDARD EXAMPLE
--
select
convert( datetimeoffset( 5 ), GETDATE(), 120 )
--
-- EXAMPLE USAGE -
--
select
*
from
vw_datetime__dst__timezone
--
-- EXAMPLE USAGE - FOR HISTORICAL DATA CONVERSION - EASTERN STANDARD
--
select
created_date,
isnull( dst.zone, 'NO TZ' ) as zone,
isnull(
case
when created_date >= dstlow and
created_date < dsthigh
then dst.daylight
else dst.standard
end,
'NO OFFSET'
) as zone_offsettime,
TODATETIMEOFFSET(
created_date,
case
when created_date >= dstlow and
created_date < dsthigh
then dst.daylight
else dst.standard
end
) as zone_time,
SWITCHOFFSET(
TODATETIMEOFFSET(
created_date,
case
when created_date >= dstlow and
created_date < dsthigh
then dst.daylight
else dst.standard
end
),
'+00:00' -- parameterize?
) as utc_time
from
(
select GETDATE() as created_date
union
select SYSDATETIMEOFFSET() as created_date
union
select '2017-01-01 15:20:24.653' as created_date
) DYNAMIC_temp_table
left outer join vw_datetime__dst__timezone dst on
created_date between yrstart and yrend and
dst.zone = 'ET'
order by
created_date
-- 这是视图 SQL：
drop view
vw_datetime__dst__timezone
go
create view
vw_datetime__dst__timezone
as
select
yr,
zone,
standard,
daylight,
rulename,
strule,
edrule,
yrstart,
yrend,
dateadd(day, (stdowref + stweekadd), stmonthref) dstlow,
dateadd(day, (eddowref + edweekadd), edmonthref) dsthigh
from (
select
yrs.yr,
timezone.zone,
timezone.standard,
timezone.daylight,
timezone.rulename,
dst_rule.strule,
dst_rule.edrule,
yrs.yr + '-01-01 00:00:00' yrstart,
yrs.yr + '-12-31 23:59:59' yrend,
yrs.yr + dst_rule.stdtpart + ' ' + dst_rule.cngtime stmonthref,
yrs.yr + dst_rule.eddtpart + ' ' + dst_rule.cngtime edmonthref,
case
when dst_rule.strule in ('1', '2', '3')
then
case
when datepart(dw, yrs.yr + dst_rule.stdtpart) = '1'
then 0
else 8 - datepart(dw, yrs.yr + dst_rule.stdtpart)
end
else (datepart(dw, yrs.yr + dst_rule.stdtpart) - 1) * -1
end as stdowref,
case
when dst_rule.edrule in ('1', '2', '3')
then
case
when datepart(dw, yrs.yr + dst_rule.eddtpart) = '1'
then 0
else 8 - datepart(dw, yrs.yr + dst_rule.eddtpart)
end
else (datepart(dw, yrs.yr + dst_rule.eddtpart) - 1) * -1
end as eddowref,
datename(dw, yrs.yr + dst_rule.stdtpart) as stdow,
datename(dw, yrs.yr + dst_rule.eddtpart) as eddow,
case
when dst_rule.strule in ('1', '2', '3')
then (7 * CAST(dst_rule.strule AS Integer)) - 7
else 0
end as stweekadd,
case
when dst_rule.edrule in ('1', '2', '3')
then (7 * CAST(dst_rule.edrule AS Integer)) - 7
else 0
end as edweekadd
from (
select '1900' yr
union select '1901' yr
union select '1902' yr
union select '1903' yr
union select '1904' yr
union select '1905' yr
union select '1906' yr
union select '1907' yr
union select '1908' yr
union select '1909' yr
union select '1910' yr
union select '1911' yr
union select '1912' yr
union select '1913' yr
union select '1914' yr
union select '1915' yr
union select '1916' yr
union select '1917' yr
union select '1918' yr
union select '1919' yr
union select '1920' yr
union select '1921' yr
union select '1922' yr
union select '1923' yr
union select '1924' yr
union select '1925' yr
union select '1926' yr
union select '1927' yr
union select '1928' yr
union select '1929' yr
union select '1930' yr
union select '1931' yr
union select '1932' yr
union select '1933' yr
union select '1934' yr
union select '1935' yr
union select '1936' yr
union select '1937' yr
union select '1938' yr
union select '1939' yr
union select '1940' yr
union select '1941' yr
union select '1942' yr
union select '1943' yr
union select '1944' yr
union select '1945' yr
union select '1946' yr
union select '1947' yr
union select '1948' yr
union select '1949' yr
union select '1950' yr
union select '1951' yr
union select '1952' yr
union select '1953' yr
union select '1954' yr
union select '1955' yr
union select '1956' yr
union select '1957' yr
union select '1958' yr
union select '1959' yr
union select '1960' yr
union select '1961' yr
union select '1962' yr
union select '1963' yr
union select '1964' yr
union select '1965' yr
union select '1966' yr
union select '1967' yr
union select '1968' yr
union select '1969' yr
union select '1970' yr
union select '1971' yr
union select '1972' yr
union select '1973' yr
union select '1974' yr
union select '1975' yr
union select '1976' yr
union select '1977' yr
union select '1978' yr
union select '1979' yr
union select '1980' yr
union select '1981' yr
union select '1982' yr
union select '1983' yr
union select '1984' yr
union select '1985' yr
union select '1986' yr
union select '1987' yr
union select '1988' yr
union select '1989' yr
union select '1990' yr
union select '1991' yr
union select '1992' yr
union select '1993' yr
union select '1994' yr
union select '1995' yr
union select '1996' yr
union select '1997' yr
union select '1998' yr
union select '1999' yr
union select '2000' yr
union select '2001' yr
union select '2002' yr
union select '2003' yr
union select '2004' yr
union select '2005' yr
union select '2006' yr -- OLD US RULES
union select '2007' yr
union select '2008' yr
union select '2009' yr
union select '2010' yr
union select '2011' yr
union select '2012' yr
union select '2013' yr
union select '2014' yr
union select '2015' yr
union select '2016' yr
union select '2017' yr
union select '2018' yr
union select '2018' yr
union select '2020' yr
union select '2021' yr
union select '2022' yr
union select '2023' yr
union select '2024' yr
union select '2025' yr
union select '2026' yr
union select '2027' yr
union select '2028' yr
union select '2029' yr
union select '2030' yr
union select '2031' yr
union select '2032' yr
union select '2033' yr
union select '2034' yr
union select '2035' yr
union select '2036' yr
union select '2037' yr
union select '2038' yr
union select '2039' yr
union select '2040' yr
union select '2041' yr
union select '2042' yr
union select '2043' yr
union select '2044' yr
union select '2045' yr
union select '2046' yr
union select '2047' yr
union select '2048' yr
union select '2049' yr
union select '2050' yr
union select '2051' yr
union select '2052' yr
union select '2053' yr
union select '2054' yr
union select '2055' yr
union select '2056' yr
union select '2057' yr
union select '2058' yr
union select '2059' yr
union select '2060' yr
union select '2061' yr
union select '2062' yr
union select '2063' yr
union select '2064' yr
union select '2065' yr
union select '2066' yr
union select '2067' yr
union select '2068' yr
union select '2069' yr
union select '2070' yr
union select '2071' yr
union select '2072' yr
union select '2073' yr
union select '2074' yr
union select '2075' yr
union select '2076' yr
union select '2077' yr
union select '2078' yr
union select '2079' yr
union select '2080' yr
union select '2081' yr
union select '2082' yr
union select '2083' yr
union select '2084' yr
union select '2085' yr
union select '2086' yr
union select '2087' yr
union select '2088' yr
union select '2089' yr
union select '2090' yr
union select '2091' yr
union select '2092' yr
union select '2093' yr
union select '2094' yr
union select '2095' yr
union select '2096' yr
union select '2097' yr
union select '2098' yr
union select '2099' yr
) yrs
cross join (
-- Dynamic, hardcoded table of timezone-based, daylight savings time (DST) rules
-- -- TIMEZONE
select 'UTC' zone, '+00:00' standard, '+01:00' daylight, 'UTC' rulename -- UTC - STAGING ONLY - this line is not accurate
union select 'CET' zone, '+01:00' standard, '+02:00' daylight, 'EU' rulename -- Centeral Europe
union select 'ET' zone, '-05:00' standard, '-04:00' daylight, 'US' rulename -- Eastern Time
union select 'CT' zone, '-06:00' standard, '-05:00' daylight, 'US' rulename -- Central Time
union select 'MT' zone, '-07:00' standard, '-06:00' daylight, 'US' rulename -- Mountain Time
union select 'PT' zone, '-08:00' standard, '-07:00' daylight, 'US' rulename -- Pacific Time
) timezone
join (
-- Dynamic, hardcoded table of country-based, daylight savings time (DST) rules
select 'UTC' rulename, 'L' strule, '-03-31' stdtpart, 'L' edrule, '-10-31' eddtpart, 1900 firstyr, 2099 lastyr, '01:00:00' cngtime
-- Country - Europe
union select 'EU' rulename, 'L' strule, '-03-31' stdtpart, 'L' edrule, '-10-31' eddtpart, 1900 firstyr, 2099 lastyr, '01:00:00' cngtime
-- Country - US
union select 'US' rulename, '1' strule, '-04-01' stdtpart, 'L' edrule, '-10-31' eddtpart, 1900 firstyr, 2006 lastyr, '02:00:00' cngtime
union select 'US' rulename, '2' strule, '-03-01' stdtpart, '1' edrule, '-11-01' eddtpart, 2007 firstyr, 2099 lastyr, '02:00:00' cngtime
) dst_rule on
dst_rule.rulename = timezone.rulename and
datepart( year, yrs.yr ) between firstyr and lastyr
) dst_dates
go
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