How to Store Only Time; Not Date and Time

Best Way to store time (Only Time and Not date) in database

It's ok to store time as time-in-milliseconds from null-date (January 1, 1970, 00:00:00 GMT).
You will be able easily made compare operations on this long data field in the DB.

How to store only time; not date and time?

You could try the INTERVAL DAY TO SECOND data type but it won't save you any disk space ... it is very suitable for this purpose though.

create table t1 (time_of_day interval day (0) to second(0));

insert into t1 values (TO_DSINTERVAL('0 23:59:59'));

select date '2009-05-13'+time_of_day
from   t1;

11 bytes though.

How to store time without date in Python so it's convenient to compare?

Just store it however you want, then use the .time() method of the datetime objects and make comparisons.

from datetime import datetime
dt1 = datetime(2008, 1, 1, 16, 0, 0)
dt2 = datetime(2008, 4, 7, 13, 30, 0)

print(dt1.time() > dt2.time())    # True

You can also just turn your datetimes into naive datetime objects if you want to do "wall clock" arithmetic on them (as opposed to "timeline" arithmetic, which should be done with UTC datetimes):

from dateutil import tz
from datetime import datetime
NEW_YORK = tz.gettz('America/New_York')
dt = datetime(2008, 1, 1, 16, 0, tzinfo=NEW_YORK)
dt_naive = dt.replace(tzinfo=None)   # datetime(2008, 1, 1, 16)

Can we extract time from date column that store only date not time?

The type date in Oracle also includes hours, minutes, etc. So unless you truncated that on insertion, it is stored. But in default setting, some clients don't show them.

Try

SELECT to_char(datecreated, 'YYYY-MM-DD HH24:MI:SS')
       FROM elbat;

to get the the year, month, day, hour, minute and second.

Store only date without time in a database

For storing only date you need DATE data type.

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MySQL has three data types for storing date and time values:

• DATE is used for values with a date part but no time part. MySQL retrieves and displays DATE values in 'YYYY-MM-DD' format.
• DATETIME type is used for values that contain both date and time parts. MySQL retrieves and displays DATETIME values in 'YYYY-MM-DD hh:mm:ss' format.
• TIMESTAMP data type is used for values that contain both date and time parts. TIMESTAMP has a range of '1970-01-01 00:00:01' UTC to '2038-01-19 03:14:07' UTC.

More details can be found in the official MySQL Reference Manual:

The DATE, DATETIME, and TIMESTAMP Types

Is it a way to store only date, no time in CloudKit?

NSDate has no concept of minutes, hours, seconds, day, months, years. NSDate is purely a reference to a single point in time.

It is only when you display a date into a readable format (like a string) that you see anything like Years, Months, Days, Hours, etc...

That is a product of the fact that an NSDate gets rendered into a human readable string for debugging.

If you don't want to show the date then don't show the date. The fact is though, someone's date of birth does actually contain hours, minutes and seconds it's just by convention that we decide to truncate it down to days only.

Just use the NSDate and when you display it just only display the date part.

BTW

When you don't show the time in a UIDatePicker then the current time will be used.

store date only, not the the time in datetime field

I just tried your ALTER statement, and it works as you expect; when I enter a row without including datecreated, it sets the value to the date with a time of 00:00:00.

The fact that you checked the table definition and it says the default is GETDATE() leads me to believe the column already existed and your ALTER failed.

How can I store the date to the table without a time stamp?

As noted in the comments to your question, values in Access Date/Time columns always have both a date and a time component. However, in most cases Access will display only the date part if the time is exactly midnight, so if you force the time to midnight when storing the value then it will look like a date-only value.

store only date in database not time portion C#

I think you are trying to specify database column type. You could use data annotations as described in this article.

Here is an example :

[Table("People")]
public class Person
{
    public int Id { get; set; }

    [Column(TypeName = "varchar")]
    public string Name { get; set; }

    [Column(TypeName="date")]
    public DateTime DOB { get; set; }
}

By default, string is translated to nvarchar, we have changed that here. Also Datetime (this is what you asked I suppose) which by default maps to datatime in sql server, is changed to date which stores only the date portion and not the time portion of a DateTime value.

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