PHP strtotime returns a 1970 date when date column is null

问题

I want to display $row->depositdate in dd-mm-yyyy format.

If the date column in database is null the date displayed is : 01-01-1970

echo "<td align=center>".date('d-m-Y', strtotime($row->depositdate))."</td>";

If the date is null in database it should display nothing , otherwise the date in dd-mm-yyyy format should be displayed.

Thanks in advance

Sandeep

回答1:

NULL is interpreted as 0 by strtotime, since it want to be passed an integer timestamp. A timestamp of 0 means 1-1-1970.

So you'll have to check for yourself if $row->depositdate === NULL, and if so, don't call strtotime at all.

回答2:

NULL is converted to 0 - the epoch (1-1-1970)

Do this instead

echo "<td align=center>".($row->depositdate ? date('d-m-Y', strtotime($row->depositdate)) : '')."</td>";

回答3:

You need to check if $row->depositdata is_null previously or check for 0 after strtotime if the value of $row->depositdata is unrecognizable for strtotime.

  echo "<td align=center>";
  if (!is_null($row->depositdate))
  {
     $jUnixDate = strtotime($row->depositdate));
     if ($jUnixDate > 0)
     {
          echo date('d-m-Y', $jUnixDate);
     }
  }
  echo "</td>";

strtotime expects to be given a string containing an English date format and will try to parse that format into a Unix timestamp (the number of seconds since January 1 1970 00:00:00 UTC), relative to the timestamp given in now, or the current time if now is not supplied.

more about unixtime and Y2K38 problem: http://en.wikipedia.org/wiki/Year_2038_problem

回答4:

Oh! I know why this happens? Simply you have not included "depositdate" in your SELECT query. Firstly Change SQL query to select all with wild card sign as shown here

$sql = "SELECT * FROM `yourtable`";

来源：https://stackoverflow.com/questions/7737363/php-strtotime-returns-a-1970-date-when-date-column-is-null

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php

date-format

strtotime