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<?php
$dt
= new
DateTimeImmutable
(
"2015-11-01 00:00:00"
, new
DateTimeZone
(
"America/New_York"
));
echo
"Start: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
$dt
=
$dt
->
add
(new
DateInterval
(
"PT3H"
));
echo
"End: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
?>
Start: 2015-11-01 00:00:00 -04:00
End: 2015-11-01 02:00:00 -05:00
示例 #2 DateTimeImmutable::modify 和 strtotime 递增/减单个组件值
在 DST 转换上添加 +24 小时将准确添加 24 小时，如日期/时间字符串中所示（除非开始/结束时间位于转换点）。
<?php
$dt
= new
DateTimeImmutable
(
"2015-11-01 00:00:00"
, new
DateTimeZone
(
"America/New_York"
));
echo
"Start: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
$dt
=
$dt
->
modify
(
"+24 hours"
);
echo
"End: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
?>
Start: 2015-11-01 00:00:00 -04:00
End: 2015-11-02 00:00:00 -05:00
<?php
echo
"Normal year:\n"
;
// 2 月有 28 天
$dt
= new
DateTimeImmutable
(
"2015-01-31 00:00:00"
, new
DateTimeZone
(
"America/New_York"
));
echo
"Start: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
$dt
=
$dt
->
modify
(
"+1 month"
);
echo
"End: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
echo
"Leap year:\n"
;
// 2 月有 29 天
$dt
= new
DateTimeImmutable
(
"2016-01-31 00:00:00"
, new
DateTimeZone
(
"America/New_York"
));
echo
"Start: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
$dt
=
$dt
->
modify
(
"+1 month"
);
echo
"End: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
?>
Normal year:
Start: 2015-01-31 00:00:00 -05:00
End: 2015-03-03 00:00:00 -05:00
Leap year:
Start: 2016-01-31 00:00:00 -05:00
End: 2016-03-02 00:00:00 -05:00
要获取下个月的最后一天（例如防止溢出），可以使用
last day of
格式。
<?php
echo
"Normal year:\n"
;
// 2 月有 28 天
$dt
= new
DateTimeImmutable
(
"2015-01-31 00:00:00"
, new
DateTimeZone
(
"America/New_York"
));
echo
"Start: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
$dt
=
$dt
->
modify
(
"last day of next month"
);
echo
"End: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
echo
"Leap year:\n"
;
// 2 月有 29 天
$dt
= new
DateTimeImmutable
(
"2016-01-31 00:00:00"
, new
DateTimeZone
(
"America/New_York"
));
echo
"Start: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
$dt
=
$dt
->
modify
(
"last day of next month"
);
echo
"End: "
,
$dt
->
format
(
"Y-m-d H:i:s P"
),
PHP_EOL
;
?>
Normal year:
Start: 2015-01-31 00:00:00 -05:00
End: 2015-02-28 00:00:00 -05:00
Leap year:
Start: 2016-01-31 00:00:00 -05:00
End: 2016-02-29 00:00:00 -05:00
