Handle Julian and Real Times in one query - sql

Question

Hi Below is some sample data
DECLARE #Time TABLE (
[Time] VARCHAR(250),
[Count] VARCHAR(250)
)
INSERT INTO #Time ([Time],[Count])
VALUES
('13:52','2'),
('13:53','2'),
('13:54','5'),
('13:55','3'),
('13:56','3'),
('13:57','1'),
('13:58','4'),
('13:59','1'),
('130','72'),
('1300','61'),
('1301','40'),
('1302','51'),
('1303','53'),
('1304','59'),
('1305','62'),
('1306','36'),
('1307','56'),
('1308','52')
Select * from #Time
Is there a way to handle both data types so that it outputs as a real time
I use a function that partly works but am getting and error each time:
Msg 8116, Level 16, State 1, Line 1
Argument data type varchar is invalid for argument 2 of dateadd function.
The function I use is as follows and wondered if this can be adopted/changed to account for the poor data eg both types of Times (Julian/Regular).
CREATE FUNCTION [dbo].[udf_TR_PROTOS_JulianTimeToSQLDateTime]
(
-- Add the parameters for the function here
#JulianTime INT
)
RETURNS DATETIME
AS
BEGIN
-- Declare the return variable here
DECLARE #Result DATETIME
-- Add the T-SQL statements to compute the return value here
IF #JulianTime >= 0 AND #JulianTime < 1440 -- this ensures that the result will be in the range of a datetime data type
SET #Result = DATEADD(MINUTE, #JulianTime, CAST('00:00' AS TIME))
ELSE
SET #Result = CAST('00:00' AS TIME)
-- Return the result of the function
RETURN #Result
END
GO
ADDITION:
The COMPLETE datetime function is here:
CREATE FUNCTION [dbo].[udf_TR_PROTOS_JulianDateTimeToSQLDateTime] (
-- Add the parameters for the function here
#JulianDate INT,
#JulianTime INT = 0
)
RETURNS DATETIME
AS
BEGIN
-- Declare the return variable here
DECLARE #Result DATETIME
-- Add the T-SQL statements to compute the return value here
IF #JulianDate > 640333 -- this ensures that the result will be in the range of a datetime data type
BEGIN
SET #Result = DATEADD(DAY, (#JulianDate-429), CAST('Jan 1 0001' AS DATETIME2))
IF #JulianTime < 1440 AND #JulianTime >= 0 -- this ensures that the time is between 00:00 and 23:59
SET #Result = DATEADD(MINUTE, #JulianTime, #Result)
END
ELSE
SET #Result = 'Jan 1 1753'
-- Return the result of the function
RETURN #Result
END
GO

Answer 1

I am not sure what exactly are you trying to do from your give information. But I tried to modify the function to return time when I pass it JulianTime as a varchar. Here is the code -- (try to make changes accordingly though)
CREATE FUNCTION [dbo].[udf_TR_PROTOS_JulianTimeToSQLDateTime]
(
-- Add the parameters for the function here
#JulianTime VARCHAR(255)
)
RETURNS TIME(0)
AS
BEGIN
-- Declare the return variable here
DECLARE #Result TIME(0), #HOUR VARCHAR(2), #MINUTES VARCHAR(2)
-- DECLARE #JulianTime VARCHAR(255)
-- SET #JulianTime = '13:02'
SET #HOUR = SUBSTRING(#JulianTime, 1, 2)
IF(LEN(#JulianTime) = 4)
SET #MINUTES = SUBSTRING(#JulianTime, 3, 2)
IF(LEN(#JulianTime) = 5)
SET #MINUTES = SUBSTRING(#JulianTime, 4, 2)
SET #Result = CONCAT(#HOUR, ':', #MINUTES)
-- PRINT #RESULT
-- Return the result of the function
RETURN #Result
END
GO

Answer 2

I've updated the FUNCTION.
CREATE FUNCTION [dbo].[udf_TR_PROTOS_JulianTimeToSQLDateTime]
(
#timeString varchar(250)
)
RETURNS TIME
AS
BEGIN
DECLARE #Result TIME ;
/* Ensure that we're working with a fixed date */
DECLARE #epoch datetime = '19000101' ;
/* Check the string for ':' */
IF CHARINDEX(':',#timeString) > 0
/* Can #timeString be parsed as a valid time? */
SET #Result = TRY_PARSE(#timeString AS time) ; /* Returns NULL if bad time string. */
ELSE
/* No ':' so check if valid julian time. */
IF TRY_CONVERT(int,#timeString) IS NOT NULL AND CONVERT(int,#timeString) BETWEEN 0 AND 1439
SET #Result = CAST( DATEADD(minute, CONVERT(int,#timeString), #epoch) AS time) ;
ELSE
SET #Result = NULL ;
RETURN #Result ;
END
http://dbfiddle.uk/?rdbms=sqlserver_2016&fiddle=1ca82cd76b2932593262601b1742f602
This will only work if you're using something greater than SQL 2012+ because of TRY_PARSE and TRY_CONVERT. If you're lower than 2012, you can modify that bit to do what those functions essentially do.

Answer 3

Select
CASE WHEN CHARINDEX(':',[Time]) > 0 THEN CAST([Time] AS TIME) ELSE DATEADD(MINUTE, TRY_CAST([Time] AS INT), CAST('00:00' AS TIME)) END AS [RealTime],
*
from #Time
This appears to do the trick, thanks for the valuable input

Answer 4

For SQL 2008, use this function:
CREATE FUNCTION [dbo].[udf_TR_PROTOS_JulianTimeToSQLDateTime]
(
#timeString varchar(250)
)
RETURNS TIME
AS
BEGIN
DECLARE #Result time ;
/* Ensure that we're working with a fixed date */
DECLARE #epoch datetime = '19000101' ;
/* Check the string for ':' */
IF CHARINDEX(':',#timeString) > 0
IF ISDATE(#timeString) = 1
/* Is #timeString a valid time object? */
SET #Result = CAST(#timeString AS time) ;
ELSE
SET #Result = NULL ;
ELSE
/* No ':' so check if valid julian time. */
IF ISNUMERIC(#timeString) = 1 AND CONVERT(int,#timeString) BETWEEN 0 AND 1439
SET #Result = CAST( DATEADD(minute, CONVERT(int,#timeString), #epoch) AS time) ;
ELSE
SET #Result = NULL ;
RETURN #Result ;
END