139

如何在 SQL Server 中将 UNIX 时间戳 (bigint) 转换为 DateTime？

4

17 回答 17

393

这对我有用：

Select
    dateadd(S, [unixtime], '1970-01-01')
From [Table]

如果有人想知道为什么 1970-01-01，这被称为Epoch time。

以下是维基百科的引述：

自 1970 年 1 月 1 日星期四 00:00:00 协调世界时 (UTC) 以来经过的秒数，[1][注 1] 不包括闰秒。

于 2011-11-23T02:59:44.520 回答
61

尝试：

CREATE FUNCTION dbo.fn_ConvertToDateTime (@Datetime BIGINT)
RETURNS DATETIME
AS
BEGIN
    DECLARE @LocalTimeOffset BIGINT
           ,@AdjustedLocalDatetime BIGINT;
    SET @LocalTimeOffset = DATEDIFF(second,GETDATE(),GETUTCDATE())
    SET @AdjustedLocalDatetime = @Datetime - @LocalTimeOffset
    RETURN (SELECT DATEADD(second,@AdjustedLocalDatetime, CAST('1970-01-01 00:00:00' AS datetime)))
END;
GO
于 2010-05-25T11:57:14.330 回答
56

如果有人遇到以下错误：

将表达式转换为数据类型 int 的算术溢出错误

由于unix时间戳在bigint（而不是int）中，您可以使用它：

SELECT DATEADD(S, CONVERT(int,LEFT(1462924862735870900, 10)), '1970-01-01')
FROM TABLE

用 unix-timestamp 替换实际列的硬编码时间戳

来源：MSSQL bigint Unix Timestamp to Datetime with milliseconds

于 2017-02-02T14:02:31.193 回答
30

像这样

以秒为单位将 Unix（纪元）日期时间添加到基本日期

这将得到它现在（2010-05-25 07:56:23.000）

 SELECT dateadd(s,1274756183,'19700101 05:00:00:000')

如果你想反向，看看这个http://wiki.lessthandot.com/index.php/Epoch_Date

于 2010-05-25T11:57:01.360 回答
13

测试这个：

Sql 服务器：

SELECT dateadd(S, timestamp, '1970-01-01 00:00:00') 
     FROM 
your_table

MySql服务器：

SELECT
  from_unixtime(timestamp) 
FROM 
  your_table

http://www.w3resource.com/mysql/date-and-time-functions/mysql-from_unixtime-function.php

于 2016-12-22T14:46:18.183 回答
8

这将做到：

declare @UNIX_TIME int
select @UNIX_TIME = 1111111111
-- Using dateadd to add seconds to 1970-01-01
select [Datetime from UNIX Time] = dateadd(!precision!,@UNIX_TIME,'1970-01-01')

而不是 !precision! 根据时间戳的精度使用：ss、ms 或 mcs。Bigint 能够保持微秒精度。

于 2010-05-25T11:58:12.143 回答
6

如果时间以毫秒为单位并且需要保存它们：

DECLARE @value VARCHAR(32) = '1561487667713';

SELECT DATEADD(MILLISECOND, CAST(RIGHT(@value, 3) AS INT) - DATEDIFF(MILLISECOND,GETDATE(),GETUTCDATE()), DATEADD(SECOND, CAST(LEFT(@value, 10) AS INT), '1970-01-01T00:00:00'))
于 2019-07-02T10:40:12.917 回答
5

添加n秒1970-01-01将为您提供UTC 日期，因为Unix 时间戳n是自 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970 以来经过的秒数。

在 SQL Server 2016 中，您可以使用AT TIME ZONE. 您只需要知道 Windows 标准格式的时区名称：

SELECT *
FROM (VALUES (1514808000), (1527854400)) AS Tests(UnixTimestamp)
CROSS APPLY (SELECT DATEADD(SECOND, UnixTimestamp, '1970-01-01') AT TIME ZONE 'UTC') AS CA1(UTCDate)
CROSS APPLY (SELECT UTCDate AT TIME ZONE 'Pacific Standard Time') AS CA2(LocalDate)

| UnixTimestamp | UTCDate                    | LocalDate                  |
|---------------|----------------------------|----------------------------|
| 1514808000    | 2018-01-01 12:00:00 +00:00 | 2018-01-01 04:00:00 -08:00 |
| 1527854400    | 2018-06-01 12:00:00 +00:00 | 2018-06-01 05:00:00 -07:00 |

或者简单地说：

SELECT *, DATEADD(SECOND, UnixTimestamp, '1970-01-01') AT TIME ZONE 'UTC' AT TIME ZONE 'Pacific Standard Time'
FROM (VALUES (1514808000), (1527854400)) AS Tests(UnixTimestamp)

| UnixTimestamp | LocalDate                  |
|---------------|----------------------------|
| 1514808000    | 2018-01-01 04:00:00 -08:00 |
| 1527854400    | 2018-06-01 05:00:00 -07:00 |

笔记：

  • 您可以通过强制转换DATETIMEOFFSET为DATETIME.
  • 转换将夏令时考虑在内。太平洋时间是 2018 年 1 月的 UTC-08:00 和 2018 年 6 月的 UTC-07:00。
于 2018-09-17T09:12:58.773 回答
3

@DanielLittle 对特定问题有最简单、最优雅的答案。但是，如果您有兴趣转换为特定时区并考虑 DST（夏令时），则以下方法效果很好：

CAST(DATEADD(S, [UnixTimestamp], '1970-01-01') AT TIME ZONE 'UTC' AT TIME ZONE 'Pacific Standard Time' AS Datetime)

注意：此解决方案仅适用于 SQL Server 2016 及更高版本（和 Azure）。

创建一个函数：

CREATE FUNCTION dbo.ConvertUnixTime (@input INT)
RETURNS Datetime
AS BEGIN
    DECLARE @Unix Datetime

    SET @Unix = CAST(DATEADD(S, @Input, '1970-01-01') AT TIME ZONE 'UTC' AT TIME ZONE 'Pacific Standard Time' AS Datetime)

    RETURN @Unix
END

您可以像这样调用该函数：

SELECT   dbo.ConvertUnixTime([UnixTimestamp])
FROM     YourTable
于 2020-08-05T22:19:56.997 回答
2

这是建立在 Daniel Little 为这个问题所做的工作的基础上，但考虑到夏令时（由于 dateadd 函数的 int 限制，适用于 01-01 1902 及更大的日期）：

我们首先需要创建一个表来存储夏令时的日期范围（来源：美国时间历史）：

CREATE TABLE [dbo].[CFG_DAY_LIGHT_SAVINGS_TIME](
  [BEGIN_DATE] [datetime] NULL,
  [END_DATE] [datetime] NULL,
  [YEAR_DATE] [smallint] NULL
) ON [PRIMARY]

GO

INSERT INTO CFG_DAY_LIGHT_SAVINGS_TIME VALUES
('2001-04-01 02:00:00.000',   '2001-10-27 01:59:59.997',    2001),
('2002-04-07 02:00:00.000',   '2002-10-26 01:59:59.997',    2002),
('2003-04-06 02:00:00.000',   '2003-10-25 01:59:59.997',    2003),
('2004-04-04 02:00:00.000',   '2004-10-30 01:59:59.997',    2004),
('2005-04-03 02:00:00.000',   '2005-10-29 01:59:59.997',    2005),
('2006-04-02 02:00:00.000',   '2006-10-28 01:59:59.997',    2006),
('2007-03-11 02:00:00.000',   '2007-11-03 01:59:59.997',    2007),
('2008-03-09 02:00:00.000',   '2008-11-01 01:59:59.997',    2008),
('2009-03-08 02:00:00.000',   '2009-10-31 01:59:59.997',    2009),
('2010-03-14 02:00:00.000',   '2010-11-06 01:59:59.997',    2010),
('2011-03-13 02:00:00.000',   '2011-11-05 01:59:59.997',    2011),
('2012-03-11 02:00:00.000',   '2012-11-03 01:59:59.997',    2012),
('2013-03-10 02:00:00.000',   '2013-11-02 01:59:59.997',    2013),
('2014-03-09 02:00:00.000',   '2014-11-01 01:59:59.997',    2014),
('2015-03-08 02:00:00.000',   '2015-10-31 01:59:59.997',    2015),
('2016-03-13 02:00:00.000',   '2016-11-05 01:59:59.997',    2016),
('2017-03-12 02:00:00.000',   '2017-11-04 01:59:59.997',    2017),
('2018-03-11 02:00:00.000',   '2018-11-03 01:59:59.997',    2018),
('2019-03-10 02:00:00.000',   '2019-11-02 01:59:59.997',    2019),
('2020-03-08 02:00:00.000',   '2020-10-31 01:59:59.997',    2020),
('2021-03-14 02:00:00.000',   '2021-11-06 01:59:59.997',    2021),
('2022-03-13 02:00:00.000',   '2022-11-05 01:59:59.997',    2022),
('2023-03-12 02:00:00.000',   '2023-11-04 01:59:59.997',    2023),
('2024-03-10 02:00:00.000',   '2024-11-02 01:59:59.997',    2024),
('2025-03-09 02:00:00.000',   '2025-11-01 01:59:59.997',    2025),
('1967-04-30 02:00:00.000',   '1967-10-29 01:59:59.997',    1967),
('1968-04-28 02:00:00.000',   '1968-10-27 01:59:59.997',    1968),
('1969-04-27 02:00:00.000',   '1969-10-26 01:59:59.997',    1969),
('1970-04-26 02:00:00.000',   '1970-10-25 01:59:59.997',    1970),
('1971-04-25 02:00:00.000',   '1971-10-31 01:59:59.997',    1971),
('1972-04-30 02:00:00.000',   '1972-10-29 01:59:59.997',    1972),
('1973-04-29 02:00:00.000',   '1973-10-28 01:59:59.997',    1973),
('1974-01-06 02:00:00.000',   '1974-10-27 01:59:59.997',    1974),
('1975-02-23 02:00:00.000',   '1975-10-26 01:59:59.997',    1975),
('1976-04-25 02:00:00.000',   '1976-10-31 01:59:59.997',    1976),
('1977-04-24 02:00:00.000',   '1977-10-31 01:59:59.997',    1977),
('1978-04-30 02:00:00.000',   '1978-10-29 01:59:59.997',    1978),
('1979-04-29 02:00:00.000',   '1979-10-28 01:59:59.997',    1979),
('1980-04-27 02:00:00.000',   '1980-10-26 01:59:59.997',    1980),
('1981-04-26 02:00:00.000',   '1981-10-25 01:59:59.997',    1981),
('1982-04-25 02:00:00.000',   '1982-10-25 01:59:59.997',    1982),
('1983-04-24 02:00:00.000',   '1983-10-30 01:59:59.997',    1983),
('1984-04-29 02:00:00.000',   '1984-10-28 01:59:59.997',    1984),
('1985-04-28 02:00:00.000',   '1985-10-27 01:59:59.997',    1985),
('1986-04-27 02:00:00.000',   '1986-10-26 01:59:59.997',    1986),
('1987-04-05 02:00:00.000',   '1987-10-25 01:59:59.997',    1987),
('1988-04-03 02:00:00.000',   '1988-10-30 01:59:59.997',    1988),
('1989-04-02 02:00:00.000',   '1989-10-29 01:59:59.997',    1989),
('1990-04-01 02:00:00.000',   '1990-10-28 01:59:59.997',    1990),
('1991-04-07 02:00:00.000',   '1991-10-27 01:59:59.997',    1991),
('1992-04-05 02:00:00.000',   '1992-10-25 01:59:59.997',    1992),
('1993-04-04 02:00:00.000',   '1993-10-31 01:59:59.997',    1993),
('1994-04-03 02:00:00.000',   '1994-10-30 01:59:59.997',    1994),
('1995-04-02 02:00:00.000',   '1995-10-29 01:59:59.997',    1995),
('1996-04-07 02:00:00.000',   '1996-10-27 01:59:59.997',    1996),
('1997-04-06 02:00:00.000',   '1997-10-26 01:59:59.997',    1997),
('1998-04-05 02:00:00.000',   '1998-10-25 01:59:59.997',    1998),
('1999-04-04 02:00:00.000',   '1999-10-31 01:59:59.997',    1999),
('2000-04-02 02:00:00.000',   '2000-10-29 01:59:59.997',    2000)
GO

现在我们为每个美国时区创建一个函数。这是假设 unix 时间以毫秒为单位。如果以秒为单位，请从代码中删除 /1000：

太平洋

create function [dbo].[UnixTimeToPacific] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @pacificdatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @pacificdatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -7 else -8 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @pacificdatetime is null 
       select @pacificdatetime= dateadd(hour, -7, @interimdatetime)
return @pacificdatetime    
end

东

create function [dbo].[UnixTimeToEastern] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @easterndatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @easterndatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -4 else -5 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @easterndatetime is null 
       select @easterndatetime= dateadd(hour, -4, @interimdatetime)
return @easterndatetime    
end

中央

create function [dbo].[UnixTimeToCentral] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @centraldatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @centraldatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -5 else -6 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @centraldatetime is null 
       select @centraldatetime= dateadd(hour, -5, @interimdatetime)
return @centraldatetime    
end

山

create function [dbo].[UnixTimeToMountain] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @mountaindatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @mountaindatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -6 else -7 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @mountaindatetime is null 
       select @mountaindatetime= dateadd(hour, -6, @interimdatetime)
return @mountaindatetime    
end

夏威夷

create function [dbo].[UnixTimeToHawaii] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @hawaiidatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @hawaiidatetime =  dateadd(hour,-10,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)

return @hawaiidatetime    
end

亚利桑那

create function [dbo].[UnixTimeToArizona] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @arizonadatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @arizonadatetime =  dateadd(hour,-7,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)

return @arizonadatetime    
end

阿拉斯加州

create function [dbo].[UnixTimeToAlaska] 
 (@unixtime bigint)
   returns datetime
   as
   begin
     declare @alaskadatetime datetime
     declare @interimdatetime datetime = dateadd(s, @unixtime/1000, '1970-01-01')
     select  @alaskadatetime =  dateadd(hour,case when @interimdatetime between begin_date and end_date then -8 else -9 end  ,@interimdatetime)
     from cfg_day_light_savings_time  where  year_date = datepart(year,@interimdatetime)
     if @alaskadatetime is null 
       select @alaskadatetime= dateadd(hour, -8, @interimdatetime)
return @alaskadatetime    
end
于 2017-03-27T20:09:24.887 回答
2 
//BIGINT UNIX TIMESTAMP CONVERSION upto Millisecond Accuracy
CREATE FUNCTION [dbo].[ConvertUnixTimestamp] (@Datetime [BIGINT]) RETURNS DATETIME
AS
BEGIN

    RETURN DATEADD(MILLISECOND, cast(@Datetime as bigint) % 1000, 
    DATEADD(SECOND, (cast(@Datetime as bigint) / 1000)%60, 
    DATEADD(MINUTE, ((cast(@Datetime as bigint) / 1000)/60)%60, 
    DATEADD(HOUR, ((cast(@Datetime as bigint) / 1000)/60)/60, '19700101'))))
END
于 2018-12-30T16:36:44.463 回答
2

我也不得不面对这个问题。不幸的是，没有一个答案（这里和其他几十页）让我满意，因为由于某处的 32 位整数强制转换，我仍然无法达到 2038 年之后的日期。

一个最终对我有用的解决方案是使用float变量，所以我至少可以有一个2262-04-11T23:47:16.854775849. 尽管如此，这并没有涵盖整个datetime领域，但它足以满足我的需求，并且可以帮助遇到同样问题的其他人。

-- date variables
declare @ts bigint; -- 64 bit time stamp, 100ns precision
declare @d datetime2(7) = GETUTCDATE(); -- 'now'
-- select @d = '2262-04-11T23:47:16.854775849'; -- this would be the max date

-- constants:
declare @epoch datetime2(7) = cast('1970-01-01T00:00:00' as datetime2(7));
declare @epochdiff int = 25567; -- = days between 1900-01-01 and 1970-01-01
declare @ticksofday bigint = 864000000000; -- = (24*60*60*1000*1000*10)

-- helper variables:
declare @datepart float;
declare @timepart float;
declare @restored datetime2(7);

-- algorithm:
select @ts = DATEDIFF_BIG(NANOSECOND, @epoch, @d) / 100; -- 'now' in ticks according to unix epoch
select @timepart = (@ts % @ticksofday) / @ticksofday; -- extract time part and scale it to fractional part (i. e. 1 hour is 1/24th of a day)
select @datepart = (@ts - @timepart) / @ticksofday; -- extract date part and scale it to fractional part
select @restored = cast(@epochdiff + @datepart + @timepart as datetime); -- rebuild parts to a datetime value

-- query original datetime, intermediate timestamp and restored datetime for comparison
select
  @d original,
  @ts unix64,
  @restored restored
;

-- example result for max date:
-- +-----------------------------+-------------------+-----------------------------+
-- | original                    | unix64            | restored                    |
-- +-----------------------------+-------------------+-----------------------------+
-- | 2262-04-11 23:47:16.8547758 | 92233720368547758 | 2262-04-11 23:47:16.8533333 |
-- +-----------------------------+-------------------+-----------------------------+

有几点需要考虑：

  • 就我而言，100ns 精度是要求，但这似乎是 64 位 unix 时间戳的标准分辨率。如果您使用任何其他分辨率，则必须相应地调整@ticksofday算法的第一行。
  • 我正在使用在时区等方面存在问题的其他系统，我发现对我来说最好的解决方案是始终使用 UTC。根据您的需要，这可能会有所不同。
  • 1900-01-01是 的原始日期datetime2，就像1970-01-01unix 时间戳的纪元一样。
  • floats 帮助我解决了 2038 年问题和整数溢出等问题，但请记住，浮点数的性能不是很好，并且可能会减慢大量时间戳的处理速度。此外，浮点数可能会由于舍入误差而导致精度损失，正如您在上面最大日期的示例结果比较中看到的那样（这里的误差约为 1.4425 毫秒）。
  • 在算法的最后一行有一个转换为datetime. 不幸的是，没有从数值显式转换为datetime2允许的，但允许将数字datetime显式转换为，而这又隐式转换为datetime2. 目前这可能是正确的，但在 SQL Server 的未来版本中可能会发生变化：要么有一个dateadd_big()函数，要么允许显式转换为，datetime2或者不允许显式转换datetime为，所以这可能会中断，也可能会出现有一天更简单的方法。
于 2019-05-20T09:44:53.640 回答
2

对于 GMT，这是最简单的方法：

Select dateadd(s, @UnixTime+DATEDIFF (S, GETUTCDATE(), GETDATE()), '1970-01-01')
于 2020-04-25T14:45:08.347 回答
2 
CREATE FUNCTION dbo.ConvertUnixToDateTime(@Datetime BIGINT)
RETURNS DATETIME
AS
BEGIN 
    RETURN (SELECT DATEADD(second,@Datetime, CAST('1970-01-01' AS datetime)))
END;
GO
于 2020-10-28T05:45:56.950 回答
1

更好的？此函数将以毫秒为单位的 unixtime 转换为日期时间。它丢失了几毫秒，但对于过滤仍然非常有用。

CREATE FUNCTION [dbo].[UnixTimestampToGMTDatetime] 
(@UnixTimestamp bigint)
RETURNS datetime
AS
BEGIN
       DECLARE @GMTDatetime datetime
       select @GMTDatetime = 
       CASE
       WHEN dateadd(ss, @UnixTimestamp/1000, '1970-01-01') 
       BETWEEN 
           Convert(DATETIME, Convert(VARCHAR(4), Year(dateadd(ss, @UnixTimestamp/1000, '1970-01-01') )) + '-03-' + Convert(VARCHAR(2), (31 - (5 * Year(dateadd(ss, @UnixTimestamp/1000, '1970-01-01') )/4 + 4) % 7)) + ' 01:00:00', 20)
       AND
           Convert(DATETIME, Convert(VARCHAR(4), Year(dateadd(ss, @UnixTimestamp/1000, '1970-01-01') )) + '-10-' + Convert(VARCHAR(2), (31 - (5 * Year(dateadd(ss, @UnixTimestamp/1000, '1970-01-01') )/4 + 1) % 7)) + ' 02:00:00', 20)
       THEN Dateadd(hh, 1, dateadd(ss, @UnixTimestamp/1000, '1970-01-01'))
       ELSE Dateadd(hh, 0, dateadd(ss, @UnixTimestamp/1000, '1970-01-01'))
       END
RETURN @GMTDatetime    
END
于 2013-02-19T16:31:43.987 回答
1

解决方案可以如下：

DECLARE @UnixTimeStamp bigint = 1564646400000 /*2019-08-01 11:00 AM*/

DECLARE @LocalTimeOffset bigint = DATEDIFF(MILLISECOND, GETDATE(), GETUTCDATE());
DECLARE @AdjustedTimeStamp bigint = @UnixTimeStamp - @LocalTimeOffset;
SELECT [DateTime] = DATEADD(SECOND, @AdjustedTimeStamp % 1000, DATEADD(SECOND, @AdjustedTimeStamp / 1000, '19700101'));
于 2019-08-01T08:02:37.553 回答
0

这是我使用的函数，它适用于大于 2038 的日期，方法是执行两步dateadd(). 它返回 UTC，但请参阅例如 Kenny对时区和 DST 处理的回答。

IF OBJECT_ID('dbo.fn_ConvertUnixToDateTime') IS NULL
  EXEC ('CREATE function dbo.fn_ConvertUnixToDateTime() returns int AS begin RETURN 0 end;')
GO
go 
alter function dbo.fn_ConvertUnixToDateTime (@unixTimestamp BIGINT)
RETURNS DATETIME
AS
/* 
    Converts unix timestamp to utc datetime. 

    To work with larger timestamps it does a two-part add, since dateadd()
    function only allows you to add int values, not bigint. 
*/ 
BEGIN
    RETURN (SELECT DATEADD( second
                        ,   @unixTimestamp % 3600
                        ,   dateadd(    hour
                                    ,   @unixTimestamp / 3600
                                    ,   CAST('1970-01-01 00:00:00' AS datetime)
                                    )
                        )
            )

END;
于 2022-01-06T13:08:59.553 回答