Just need to format the values o match yours
$someDay = "2018-12-01";
$spring = (new DateTime('March 20'))->format("Y-m-d");
$summer = (new DateTime('June 20'))->format("Y-m-d");
$fall = (new DateTime('September 22'))->format("Y-m-d");
$winter = (new DateTime('December 21'))->format("Y-m-d");
switch(true) {
case $someDay >= $spring && $someDay < $summer:
echo 'It\'s Spring!';
break;
case $someDay >= $summer && $someDay < $fall:
echo 'It\'s Summer!';
break;
case $someDay >= $fall && $someDay < $winter:
echo 'It\'s Fall!';
break;
default:
echo 'It must be Winter!';
}
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solved Check season of year in php