Essential Books

getTimestamp

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getTimeStemp is a unix representation of a datetime object. 

$date = new DateTime();
echo $date->getTimestamp();

this will out put an integer indication the seconds that have elapsed since 00:00:00 UTC, Thursday, 1 January 1970.

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DateTime class:
* Datetime Class
* getTimestamp
* setDate
* Add or Subtract Date Intervals
* Create DateTime from custom format
* Printing DateTimes
* Create Immutable version of DateTime from Mutable prior PHP 5.6
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