Sqlite does have a date format, it is physically a 64 bit floating point
number. There are functions to transform in and out of that format to
present dates as required by the user. The Sqlite date format uses a
magib epoch which matches all of the major internaional date systems.
P Kishor wrote:
There is no "DATE" format in SQLite. Dates are stored as strings. The
only formats SQLite knows and understands are TEXT, REAL, INTEGER,
BLOB, and NULL (see the link on datatypes). On the other hand, there
are built-in functions that can act on your date strings and convert
them back and forth, manipulate them, etc. Once again, see the link on
working with dates on the SQLite wiki.
On 6/4/07, Chris Fonnesbeck <[EMAIL PROTECTED]> wrote:
I'm at a complete loss about how to work with dates in SQLite. The
documentation doesnt seem to be helping me. I have a table with some date
fields, in the proper yyyy-mm-dd format:
sqlite> select First_Capture from PIT_manatees limit 5;
1997-6-17
1998-5-6
1997-6-24
1998-5-6
2000-3-15
however, it does not respond properly to comparisons to dates:
sqlite> select First_Capture from PIT_manatees where
First_Capture<2000-1-1
limit 5;
sqlite>
this doesnt work either:
sqlite> select First_Capture from PIT_manatees where
First_Capture<date('2000-1-1') limit 5;
sqlite>
note that these columns are in the 'date' format.
Yet more strangeness:
sqlite> select date(First_Capture) from PIT_manatees limit 10;
1999-10-13
sqlite>
Not sure what that is all about -- all the results are blank except one,
ewven though every record is in exactly the same format.
I'm totally perplexed by date handling in SQLite, so any help is most
appreciated.
Thanks,
--
Christopher J. Fonnesbeck
Population Ecologist, Marine Mammal Section
Fish & Wildlife Research Institute (FWC)
St. Petersburg, FL
Adjunct Assistant Professor
Warnell School of Forestry and Natural Resources
University of Georgia
Athens, GA
T: 727.235.5570
E: Chris dot Fonnesbeck at MyFWC dot com
-----------------------------------------------------------------------------
To unsubscribe, send email to [EMAIL PROTECTED]
-----------------------------------------------------------------------------
