Showing entries with tag "Unixtime".

Found 8 entries

MySQL unix times

When dealing with dates and MySQL often you have to work data that's in unixtime. If you want to insert data into a MySQL table with a datetime field you can do this:

INSERT INTO MyTable VALUES (MyDateField) (FROM_UNIXTIME(1285695703));

If you have data in MySQL as a datetime and you want to extract it as unixtime do this:

SELECT UNIX_TIMESTAMP(MyDateField) AS MyUnixField FROM MyTable;
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Javascript: Unixtimes and Leap Seconds

There is going to be a leap second today at 1230768000 (2008 December 31, 23h 59m 60s). I updated my Javascript Unixtime converter to include options for UTC time. Happy Leap Seconds!

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Linux date manipulation

The date command in Linux is very powerful for converting dates and times. If you have a given time in another timezone, or even UTC, you can convert it to your local timezone with this command:

date -d '2008-05-13 14:00 UTC'

If you want to convert a given time into unixtime just use a date format:

date +%s -d '2008-05-13 14:00 UTC'
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Random MySQL Dates

Here is a good way to generate a random date that you can use in MySQL.

SELECT FROM_UNIXTIME(RAND() * 2147483648) AS MyDate;

or

INSERT INTO TableName (DateField) VALUES (FROM_UNIXTIME(RAND() * 2147483648));
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Postgres + Unixtime

Here's how you get unixtime from a Postgres date field.

SELECT extract('epoch' from DateField) AS UnixTime FROM Table;
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Javascript Unixtime

Just a note of how to get Unixtime in Javascipt.

var date_obj    = new Date;
var unixtime_ms = date_obj.getTime();
var unixtime    = parseInt(unixtime_ms / 1000);

Also a Javascript Unixtime conversion utility.

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Javascript Unixtime converter

I always end up trying to figure out what a unixtime is in human readable format, or vice versa. I ended up borrowing and updating a tool from captain.at, striping out all the ads and other junk and cleaning it up so it's XHTML compliant. Check out my new and improved javascript unixtime converter.

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SQLite and Dates

SQLite handles dates quite strangely. If you create a table and put a date in it, the only way SQLite will take the input is "2004-06-01 12:00:00" anything else it won't recognize as a date and thus none of the date functions will work.

Assuming you have a date entered propely (like above) you get date information from the db like so.

SELECT date(DateField) FROM Table;
SELECT time(DateField) FROM Table;
SELECT datetime(DateField) FROM Table;

If you want unix time (seconds since the epoch) you have to format the output.

SELECT strftime("%s", DateField) FROM Table

However that will return the time in UTC which is probably not what you want (it's not what I wanted). I want it to compensate for my local timezone and thus you have to tell it to use your timezone.

SELECT strftime("%s", DateField, 'localtime') FROM Table

This will go the other way. Take a unixtime, and convert it to a SQLite date format.

SELECT datetime(1092941466, 'unixepoch', 'localtime');

Some semi-official SQLite documentation on how it handles dates is availble on their wiki page.

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