I have a table that stores date/time values as julian days in SQLite (using the julianday() function). I can't seem to figure out how to convert them back to ISO 8601 style strings (YYYY-mm-ddThh:m:ss.sss) when I read them?
Just feed the Julian day number to the datetime function:
A time string can be in any of the following formats:
[...]
12. DDDDDDDDDD
[...]
Format 12 is the Julian day number expressed as a floating point value.
So datetime(julianday_output) goes in the opposite direction as the julianday function:
sqlite> select datetime(julianday(current_timestamp)) as dt_from_jd, current_timestamp as dt;
dt_from_jd | dt
2011-09-30 14:46:52 | 2011-09-30 14:46:52
Have you tried strftime? http://www.sqlite.org/lang_datefunc.html
Related
I'm trying to convert the snowflake timestamp that is compatible with Iterable date format
My attempt:
I have a table with the following timestamps:
|------------------------------|
| table_timestamp |
|------------------------------|
| "2021-07--19 02:45:91.000 Z" |
|------------------------------|
I tried using TIMESTAMP_TZ and I got the following resut
SELECT table_timestamp::TIMESTAMP_TZ
from my_table
gave me output 2021-07--19 02:45:91.000 +0000
How can I get the above timestamp in this format 2021-07--19 02:45:91 +00:00?
You can cast to a varchar and give, as the second parameter, the format that you want:
SELECT TO_VARCHAR('2021-07-19 02:45:31.000'::Timestamp_TZ, 'yyyy-mm-dd hh:mi:ss')
2021-07-19 02:45:31
(Note I changed the seconds to 31 as there isn't 91 seconds in a minute and also changed your double dash between month and day to a single. I'm assuming those were typos)
Give you are correct converting the date/timestamp, this is not a convertion problem, it is a presentation problem.
Thus the Date and Time output formatting help is what you need.
I am working locally with an sqllite DB. I have imported some records from teradata where there was a date field in the format of 'YYYY-MM-DD'. When i imported the records the date switched from a date to a number. I know this is a feature of sqllite and that one can access it via date(sqllite_date) when selecting it in a where clause.
My problem is that the dates now appear to be a bit odd. For example the year appears to be negative.
Is there anyway to recover this to the correct format?
Below is an example of converting a number in the database into a date
SELECT date(18386)
# -4662-03-28
SELECT datetime('now')
# 2021-02-11 10:41:52
SELECT date(sqllite_date) FROM mydb
# Returns -4662-03-28
# Should return 2020-05-04
I am very new to this area so apologies if this is a basic question. Thank you very much for your time
In SQLite you can store dates as TEXT, REAL or INTEGER.
It seems that you stored the dates in a column with INTEGER or REAL affinity.
In this case, if you use the function date(), it considers a value like 18386 as a Julian day, meaning the number of days since noon in Greenwich on November 24, 4714 B.C.
This is why date(18386) returns 4662-03-28B.C.
But I suspect that the date values that you have are the number of days since '1970-01-01'.
In this case, 18386 days after '1970-01-01' is '2020-05-04'.
So you can get the dates in the format YYYY-MM-DD if you add the value of your column as days to '1970-01-01':
SELECT date('1970-01-01', datecolumn || ' day') FROM tablename
Or by transforming your date values to seconds and treat them as UNIX time (the number of seconds since '1970-01-01 00:00:00 UTC'):
SELECT date(datecolumn * 24 * 3600, 'unixepoch') FROM tablename
Replace datecolumn with the name of your column.
How to calculate time difference in HH:MM:SS format in SQLite?
SELECT time(strftime('%s','2017-11-01 22:25:28') - strftime('%s','2017-11-01'));
gives me:
12:00:00
and
SELECT datetime(strftime('%s','2017-11-01 22:25:28') - strftime('%s','2017-11-01'));
gives me:
-4492-12-04 12:00:00
As documented in the documentation, numbers are interpreted as Julian date numbers by default.
If your value is a number of seconds, you have to interpret it as a number of seconds, i.e., as a Unix timestamp:
SELECT time(strftime('%s','2017-11-01 22:25:28') - strftime('%s','2017-11-01'), 'unixepoch');
I wish to convert following value which is a chararray in pig
2016-05-11 23:59:57.628197
to
2016-05-11T23:59:57.628-05:00
How can I do it ?
Following is what I tried considering alias 'a2' contains list of datetime values in chararray in the column named 'input_date_value'
FOREACH a2 GENERATE input_date_value AS input_date:chararray,
ToDate(input_date_value,'YYYY-MM-DD HH:mm:ss.SSSSSS') AS modification_datetime:datetime;
For input -
2002-07-11 16:58:40.249764
Output is -
2002-01-11T16:58:40.249-05:00
The month values like '07' are not getting picked up,
The created timestamp has month set to 01' i.e. January everytime for all dates.
Can someone help. What am I doing wrong ?
https://pig.apache.org/docs/r0.11.1/func.html#to-date ToDate takes SimpleDateFormat only supports milliseconds http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html
The -05:00 you see is the time zone ToDate is actually truncating to 3 digits as it supports only milliseconds
Use lowercase character d instead of uppercase D for parsing date values.
Now, I have managed to fix it myself on (In Pig 0.11)
Apparently Pig 0.11 does not support the date format components I used earlier for parsing the month and date.
I found below inference which hints on the incompatibility as mentioned https://www.w3.org/TR/NOTE-datetime
Use:
'YYYY-MM-dd HH:mm:ss.SSSSSS'
instead of 'YYYY-MM-DD HH:mm:ss.SSSSSS'
It now gives correct output.
Input:
2001-11-28 16:04:49.22388
Output:
2001-11-28T16:04:49.223-05:00
I want to select the dates in ascending order. Dates are stored in dd-MMM-yy(02-Mar-12) format. Here is my query:
SELECT EventDate,Event,ID from EventCalenderTable Order By EventDate ASC
output is:
10-03-12
12-02-12
15-01-12
18-07-12
But the output should like:
15-01-12
12-02-12
10-03-12
18-07-12
Event Date is date datatype.
I have seen number of post about storing date in sql. I noticed that Convert function done the tricks in sql server. But how can I do this in Sqlite??
Thanks in advance.
SQLite only knows three date formats:
Text ISO8601 strings ("YYYY-MM-DD HH:MM:SS.SSS")
Real Julian day numbers since November 24, 4714 B.C
Integer number of seconds since 1970-01-01 00:00:00 UTC
SQLite does have five date/time functions for converting between formats.