I have SQLite DB one table contains datetime field
with datatype "timestamp" REAL value is 18696.0
attach image for table structure
So, I want this 18696.0 value to be converted into MySQL Y-m-d format and result should be 2021-03-10
I have didn't found any solution online. any help would be appreciated.
SQLite timestamp converted into MySQL timestamp.
EDIT: Thankyou for updating your question with the correct number and what date it should represent.
You can achieve what you need with a function that adds the days onto the Unix Epoch date:
function realDateToYmd($real, $outputFormat='Y-m-d')
{
$date = new DateTime('1970-01-01');
$date->modify('+' . intval($real) . ' days');
return $date->format($outputFormat);
}
echo realDateToYmd('18696.0');
// returns 2021-03-10
SQLite dates stored in REAL data type stores dates as a Julian Day.
From https://www.sqlite.org/datatype3.html
REAL as Julian day numbers, the number of days since noon in Greenwich on November 24, 4714 B.C. according to the proleptic Gregorian calendar.
PHP has a jdtogregorian function, in which one comment has a handy function to convert to ISO8601 dates:
function JDtoISO8601($JD) {
if ($JD <= 1721425) $JD += 365;
list($month, $day, $year) = explode('/', jdtogregorian($JD));
return sprintf('%+05d-%02d-%02d', $year, $month, $day);
}
echo JDtoISO8601('17889.0');
// Results in -4664-11-16
The results don't exactly look right, is it definitely 17889.0 in SQLite?
If this float number 18696.0 represents the number of days since 1970-01-01 then the date can also be calculated like this:
$days = 18696.0;
$dt = date_create('#'.((int)($days * 86400)));
$mysqlDate = $dt->format('Y-m-d'); //"2021-03-10"
background information
Or simply with gmdate:
$mySqlDate = gmdate('Y-m-d',$days*86400);
The days are simply converted into seconds to get a valid timestamp for gmdate.
Try this:
<?php
echo date('Y-m-d H:i:s', 17889);
?>
Output:
1970-01-01 04:58:09
Related
Suppose I have a time string '9:30' which I want to convert to timestamp.
What I do right now is extracting it and manually calculate the timestamp.
list($hour, $minute) = explode(':', '9:30');
$timestamp = $hour * 3600 + $minute * 60;
I'm wondering whether there is a smart way using Carbon or DateTime object.
use strtotime()
manual
$time = '9:30';
$timestamp = strtotime($time);
echo date('H:i',$timestamp);
I don't think you'll be able to get a timestamp from only hour or minute, as timestamp is number of seconds from 00:00:00 Thursday 1 January 1970 (check wikipedia link for more details). So without the date part you can't have a timestamp. Could you please explain how you're planning to use this?
If you're planning to calculate a different timestamp from a given datetime, then you can just do it differently. Say you're planning to get the timestamp 1 day or 24 hours after given time, then you can do it like this (non object oriented way):
$givenTimestamp = strtotime('17-06-2018 09:30:00');
$dayInSeconds = 24*60*60;
$calculatedTimeStamp = $givenTimestamp + $dayInSeconds;
If you're just trying to get how many seconds has been passed for the time section of the timestamp (like 9:30 in your example for a given day), then you can just do it like this:
list($hour, $minute) = explode(':', date ('H:i', strtotime('2018-06-16 09:30:00')));
$secondsSinceStartOfDay = intval($hour)*60*60 + intval($minute) * 60;
You may get the same result without using the intval on $hour and $minute, but it would be better to use intval on them to avoid possible issues in some cases.
Update with Carbon
From Carbon documentation, it seems like you still need the date part to generate the timestamp. So if you have your $date like this '2018-06-16' and $time like this '09:30', then you can recreate your datetime like this:
$dateTimeString = $date .' '. $time .':00';
$carbonDateTime = Carbon::parse($dateTimeString);
// $carbonDateTime will now have your date time reference
// you can now get the timestamp like this
echo $carbonDateTime->timestamp;
I have a string: 30/06/18 (30th June 2018)
I am converting to a date:
$calcFieldDate = date_create_from_format('d/m/y', '30/06/18')->format('d-m-Y');
echo $calcFieldDate;
Result: 18-06-2018
Now I want to add 20 days to the date:
$expiryDate = date("d-m-Y", strtotime("+20 days", $calcFieldDate));
echo $expiryDate;
Expected Result: 08-07-2018
Actual Result: 31-01-1970
I am obviously creating a date format which is then subsequently being treated as a string...
Every time I try a conversion, I just hit another road block - is there anyway to create a date that is then treated like a date?
$calcFieldDate = date_create_from_format('d/m/y', '30/06/18')->format('d-m-Y');
echo $calcFieldDate;
Result:30-06-2018
$expiryDate = date("d-m-Y", strtotime("+20 days", strtotime($calcFieldDate)));
echo $expiryDate;
Result:20-07-2018
Strtotime() The second parameter is the timestamp
You actually don't need to revert using strtotime and date functions, you can actually use DateTime to simply add dates into it:
$calcFieldDate = date_create_from_format('d/m/y', '30/06/18');
echo $calcFieldDate->format('d-m-Y'); // get inputted date
$expiryDate = clone $calcFieldDate; // clone the original date object
$expiryDate->modify('+20 days'); // adjust the cloned date
echo $expiryDate->format('d-m-Y'); // show the adjusted date
This will sort your problem.
$str="30/06/18 (30th June 2018)";
$arr_temp=explode(" ",$str);
$str_date=str_replace("/","-",$arr_temp[0]);
$dt = DateTime::createFromFormat('d-m-y',$str_date);
$date=$dt->format('d-m-Y');
$new_date=date('d-m-Y',strtotime("+20 days",strtotime($date)));
echo $new_date;
I have a PHP date in a database, for example 8th August 2011. I have this date in a strtotime() format so I can display it as I please.
I need to adjust this date to make it 8th August 2013 (current year). What is the best way of doing this? So far, I've been racking my brains but to no avail.
Some of the answers you have so far have missed the point that you want to update any given date to the current year and have concentrated on turning 2011 into 2013, excluding the accepted answer. However, I feel that examples using the DateTime classes are always of use in these cases.
The accepted answer will result in a Notice:-
Notice: A non well formed numeric value encountered......
if your supplied date is the 29th February on a Leapyear, although it should still give the correct result.
Here is a generic function that will take any valid date and return the same date in the current year:-
/**
* #param String $dateString
* #return DateTime
*/
function updateDate($dateString){
$suppliedDate = new \DateTime($dateString);
$currentYear = (int)(new \DateTime())->format('Y');
return (new \DateTime())->setDate($currentYear, (int)$suppliedDate->format('m'), (int)$suppliedDate->format('d'));
}
For example:-
var_dump(updateDate('8th August 2011'));
See it working here and see the PHP manual for more information on the DateTime classes.
You don't say how you want to use the updated date, but DateTime is flexible enough to allow you to do with it as you wish. I would draw your attention to the DateTime::format() method as being particularly useful.
strtotime( date( 'd M ', $originaleDate ) . date( 'Y' ) );
This takes the day and month of the original time, adds the current year, and converts it to the new date.
You can also add the amount of seconds you want to add to the original timestamp. For 2 years this would be 63 113 852 seconds.
You could retrieve the timestamp of the same date two years later with strtotime() first parameter and then convert it in the format you want to display.
<?php
$date = "11/08/2011";
$time = strtotime($date);
$time_future = strtotime("+2 years", $time);
$future = date("d/m/Y", $time_future);
echo "NEW DATE : " . $future;
?>
You can for instance output it like this:
date('2013-m-d', strtotime($myTime))
Just like that... or use
$year = date('Y');
$myMonthDay = date('m-d', strtotime($myTime));
echo $year . '-' . $myMonthDay;
Use the date modify function Like this
$date = new DateTime('2011-08-08');
$date->modify('+2 years');
echo $date->format('Y-m-d') . "\n";
//will give "2013-08-08"
I am getting a date back from a mysql query in the format YYYY-MM-DD.
I need to determine if that is more than three months in the past from the current month.
I currently have this code:
$passwordResetDate = $row['passwordReset'];
$today = date('Y-m-d');
$splitCurrentDate = explode('-',$today);
$currentMonth = $splitCurrentDate[1];
$splitResetDate = explode('-', $passwordResetDate);
$resetMonth = $splitResetDate[1];
$diferenceInMonths = $splitCurrentDate[1] - $splitResetDate[1];
if ($diferenceInMonths > 3) {
$log->lwrite('Need to reset password');
}
The problem with this is that, if the current month is in January, for instance, giving a month value of 01, and $resetMonth is November, giving a month value of 11, then $differenceInMonths will be -10, which won't pass the if() statement.
How do I fix this to allow for months in the previous year(s)?
Or is there a better way to do this entire routine?
Use strtotime(), like so:
$today = time(); //todays date
$twoMonthsLater = strtotime("+3 months", $today); //3 months later
Now, you can easily compare them and determine.
I’d use PHP’s built-in DateTime and DateInterval classes for this.
<?php
// create a DateTime representation of your start date
// where $date is date in database
$resetDate = new DateTime($date);
// create a DateIntveral representation of 3 months
$passwordExpiry = new DateInterval('3M');
// add DateInterval to DateTime
$resetDate->add($passwordExpiry);
// compare $resetDate to today’s date
$difference = $resetDate->diff(new DateTime());
if ($difference->m > 3) {
// date is more than three months apart
}
I would do the date comparison in your SQL expression.
Otherwise, PHP has a host of functions that allow easy manipulation of date strings:
PHP: Date/Time Functions - Manual
I have this to select a date from a mysql db, and compare it to an array of month-names in swedish language.
$monthnames = array("","Januari","Februari","Mars","April","Maj","Juni","Juli","Augusti","September","Oktober","November","December");
$postdate = $monthnames[date("n", strtotime( $row['modify_date'] ))];
//Outputs something like '12 Februari'
Here is the prob, I want to check the $postdate variable and change it to "Today", "Yesterday" and "Day before yesterday" according to the date, how can I do so?
Thanks
If you're using timestamps to store dates in the database:
You can have preset intervals like:
$day = mktime(0,0,0,2,1,2001)-mktime(0,0,0,1,1,2001);
And you can compare the time now - timestamps/dates you have in the database with those intervals.
For example, let's say $dbTime contains a timestamp fetched with mysql:
$time = time() - $dbTime;
if($time<$day)
echo 'posted today';
elseif($time<($day*2))
echo 'posted yesterday';
etc etc.
Then you can use PHP's Date function to echo hrs, minutes, secs, or dates, if they are larger than your predefined intervals.
There is no such in-built function in PHP. You got to do calculations, the mktime function can be your friend in this case.
if (date of $timenow == date of $timepost) { today; }
else if (date of $timenow - 24h == date of $timepost) { yesterday; }
etc.
Be aware about summer/winter time change, timezones etc. so try to use mktime()
http://php.net/date