PHP、DateTime、时间、日期、时区

1. 日期和时间比较

$date1 = new DateTime("2023-03-08");
$date2 = new DateTime("2023-03-10");

if ($date1 < $date2) {
    echo "Date 1 is earlier than Date 2";
} else {
    echo "Date 1 is later than or equal to Date 2";
}
2. 时间间隔计算

$date1 = new DateTime("2023-03-08 10:00:00");
$date2 = new DateTime("2023-03-10 15:30:00");

$interval = $date1->diff($date2);

echo "The time interval is " . $interval->fORMat("%d days, %h hours, %i minutes, and %s seconds");
3. 日期格式化

$date = new DateTime("2023-03-08");

echo "The formatted date is " . $date->format("Y-m-d");
4. 时区转换

$date = new DateTime("2023-03-08 10:00:00");
$date->setTimezone(new DateTimeZone("Asia/Tokyo"));

echo "The time in Tokyo is " . $date->format("H:i");
5. 日期验证

$date = "2023-03-08";

if (DateTime::createFromFormat("Y-m-d", $date) !== false) {
    echo "The date is valid";
} else {
    echo "The date is invalid";
}
6. 时间戳操作

$timestamp = time();

echo "The current timestamp is " . $timestamp;

$date = new DateTime();
$date->setTimestamp($timestamp);

echo "The date from the timestamp is " . $date->format("Y-m-d");
7. 生日计算

$birthdate = new DateTime("1980-01-01");
$today = new DateTime();

$interval = $birthdate->diff($today);

echo "The person is " . $interval->y . " years, " . $interval->m . " months, and " . $interval->d . " days old";
8. 约会的持续时间

$start = new DateTime("2023-03-08 10:00:00");
$end = new DateTime("2023-03-10 15:30:00");

$interval = $end->diff($start);

echo "The date lasted for " . $interval->format("%d days, %h hours, %i minutes, and %s seconds");
9. 倒计时

$deadline = new DateTime("2023-03-31");
$today = new DateTime();

if ($deadline > $today) {
    $interval = $deadline->diff($today);

    echo "Days until the deadline: " . $interval->days;
} else {
    echo "The deadline has passed";
}
10. 星期和月份的判断

$date = new DateTime("2023-03-08");

echo "The date is on a " . $date->format("l");
echo "The date is in the month of " . $date->format("F");