In Laravel, query statements are one of the most commonly used functions in the Laravel framework. Due to differences in data volume and query requirements, we often encounter situations where we need to query records between two dates. Although the query builder provided by the Laravel framework is very powerful, if we do not master its clever usage, we will encounter some troubles in the process of writing query statements. This article will introduce how to query records between two dates in Laravel.

First of all, it should be clear that in Laravel, you can find records between two dates through the whereBetween() method of the query builder. The whereBetween() method accepts two parameters, namely the field name and an array. Among them, two elements of the array represent two dates.

For example, when querying users whose registration date in the users table is within a certain time range, you can use the following code:

$users = DB::table('users')
                ->whereBetween('created_at', ['2021-06-01', '2021-06-30'])
                ->get();

The above code will return user information with register_date in June 2021 . Among them, created_at is a date field in the users table, and the whereBetween() method specifies the value range of this field. The get() method is used to obtain query results, and returns a Collection object containing the query results.

In addition to the whereBetween() method, we can also use the whereDate() method to query the records of a certain day. For example, when querying the users table for users whose registration date is a certain day, you can use the following code:

$users = DB::table('users')
                ->whereDate('created_at', '2021-06-01')
                ->get();

The above code will return user information with regist_date equal to June 1, 2021. The whereDate() method specifies the record with the value of the created_at field as June 1, 2021. The get() method is also used to obtain query results.

In addition to the whereBetween() method and whereDate() method, Laravel also provides some other methods for querying dates. These methods include whereDay(), whereMonth(), whereYear(), whereTime(), whereHour(), etc. These methods are used to query information on a certain day, a certain month, a certain year, a certain time, etc. The usage method is similar to the whereBetween() method and whereDate() method, so I won’t go into details here.

It should be noted that the date query method in Laravel's query builder uses UTC time by default, not local time. This means that no matter what the local time is, the query will be calculated in UTC time. Therefore, when performing date queries, you need to ensure that the date parameters passed in are consistent with UTC time.

In practical applications, in order to avoid query errors caused by time zone issues, we usually specify the time zone before querying or in the configuration file. Laravel provides a way to configure the time zone globally, that is, setting the timezone in the config/app.php file.

In Laravel, the method to convert time to UTC time is as follows:

$date = new Carbon('2021-06-01 12:00:00', 'Asia/Shanghai');
$utcDate = $date->utc();

The above code converts the local time '2021-06-01 12:00:00' to UTC time and assigns a value Give the $utcDate variable. Carbon is a date and time processing class built into Laravel, which is very convenient to use. This class provides a variety of time conversion methods to easily meet the needs of various scenarios.

To sum up, this article introduces how to query records between two dates in Laravel. When using the query builder to perform date queries, you need to pay attention to the time zone setting and whether the date parameters passed in are consistent with UTC time. The flexible use of query builder can make our development more concise and efficient.

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