sql server - How to check whether (var)char is a valid ISO date (112) -



sql server - How to check whether (var)char is a valid ISO date (112) -

i have char(8) field should contain value in yyyymmdd dateformat. given (hypothetical) table id(int)|datestring(char(8)) able

select id, isvaliddate(datestring) my_hypothetical_table

it's of import me can run query (so could, example, select * othertable inner bring together hypothetical_table on hypothetical_table.id = othertable.hypothetical_fk isvaliddate(hypothetical_table.datestring) = 1). catching errors doesn't seem viable.

note isdate() function works slash delimited dates, , not yyyymmdd formats.

you may want add together check length if unsure values beingness 8 digits in length.

declare @mytable table (id int, datestring char(8)) insert @mytable values (1, '20110711') insert @mytable values (2, '2011') insert @mytable values (3, '20110228') insert @mytable values (4, '20110229') insert @mytable values (5, '2011071') insert @mytable values (6, '201107') select id, datestring, isdate(datestring) isdate @mytable

running produces output:

id datestring isdate ----------- ---------- ----------- 1 20110711 1 2 2011 1 3 20110228 1 4 20110229 0 5 2011071 0 6 201107 1

sql-server tsql datetime

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