Migrating dates into Drupal
Today we will learn how to migrate dates into Drupal. Depending on your field type and configuration, there are various possible combinations. You can store a single date or a date range. You can store only the date component or also include the time. You might have timezones to take into account. Importing the node creation date requires a slightly different configuration. In addition to the examples, a list of things to consider when migrating dates is also presented.
Getting the code
You can get the full code example at https://github.com/dinarcon/ud_migrations The module to enable is
UD date whose machine name is
ud_migrations_date. The migration to execute is
udm_date. Notice that this migration writes to a content type called
UD Date and to three fields:
field_ud_datetime. This content type and fields will be created when the module is installed. They will also be removed when the module is uninstalled. The module itself depends on the following modules provided by Drupal core:
Note: Configuration placed in a module’s
config/install directory will be copied to Drupal’s active configuration. And if those files have a
dependencies/enforced/module key, the configuration will be removed when the listed modules are uninstalled. That is how the content type and fields are automatically created.
PHP date format characters
To migrate dates, you need to be familiar with the format characters of the
date PHP function. Basically, you need to find a pattern that matches the date format you need to migrate to and from. For example,
January 1, 2019 is described by the
F j, Y pattern.
As mentioned in the previous post, you need to pay close attention to how you create the pattern. Upper and lowercase letters represent different things like
y for the year with four-digits versus two-digits, respectively. Some date components have subtle variations like
j for the day with or without leading zeros respectively. Also, take into account white spaces and date component separators. If you need to include a literal letter like
T it has to be escaped with
\T. If the pattern is wrong, an error will be raised, and the migration will fail.
Date format conversions
For date conversions, you use the
format_date plugin. You specify a
from_format based on your source and a
to_format based on what Drupal expects. In both cases, you will use the PHP date function's format characters to assemble the required patterns. Optionally, you can define the
to_timezone configurations if conversions are needed. Just like any other migration, you need to understand your source format. The following code snippet shows the source and destination sections:
source: plugin: embedded_data data_rows: - unique_id: 1 node_title: 'Date example 1' node_creation_date: 'January 1, 2019 19:15:30' src_date: '2019/12/1' src_date_end: '2019/12/31' src_datetime: '2019/12/24 19:15:30' destination: plugin: 'entity:node' default_bundle: ud_date
Node creation time migration
The node creation time is migrated using the
created entity property. The source column that contains the data is
node_creation_date. An example value is
January 1, 2019 19:15:30. Drupal expects a UNIX timestamp like
1546370130. The following snippet shows how to do the transformation:
created: plugin: format_date source: node_creation_date from_format: 'F j, Y H:i:s' to_format: 'U' from_timezone: 'UTC' to_timezone: 'UTC'
Following the documentation,
F j, Y H:i:s is the
U is the
to_format. In the example, it is assumed that the source is provided in
UTC. UNIX timestamps are expressed in
UTC as well. Therefore, the
to_timezone are both set to that value. Even though they are the same, it is important to specify both configurations keys. Otherwise, the from timezone might be picked from your server’s configuration. Refer to the article on user migrations for more details on how to migrate when UNIX timestamps are expected.
Date only migration
The Date module provided by core offers two storage options. You can store the date only, or you can choose to store the date and time. First, let’s consider a date only field. The source column that contains the data is
src_date. An example value is
'2019/12/1'. Drupal expects date only fields to store data in
Y-m-d format like
'2019-12-01'. No timezones are involved in migrating this field. The following snippet shows how to do the transformation.
field_ud_date/value: plugin: format_date source: src_date from_format: 'Y/m/j' to_format: 'Y-m-d'
Date range migration
The Date Range module provided by Drupal core allows you to have a start and an end date in a single field. The
src_date_end source columns contain the start and end date, respectively. This migration is very similar to date only fields. The difference is that you need to import an extra subfield to store the end date. The following snippet shows how to do the transformation:
field_ud_date_range/value: '@field_ud_date/value' field_ud_date_range/end_value: plugin: format_date source: src_date_end from_format: 'Y/m/j' to_format: 'Y-m-d'
value subfield stores the start date. The source column used in the example is the same used for the
field_ud_date field. Drupal uses the same format internally for date only and date range fields. Considering these two things, it is possible to reuse the
field_ud_date mapping to set the start date of the
field_ud_date_range field. To do it, you type the name of the previously mapped field in quotes (') and precede it with an at sign (@). Details on this syntax can be found in the blog post about the migrate process pipeline. One important detail is that when
field_ud_date was mapped, the
value subfield was specified:
field_ud_date/value. Because of this, when reusing that mapping, you must also specify the subfield:
end_value subfield stores the end date. The mapping is similar to
field_ud_date expect that the source column is
Note: The Date Range module does not come enabled by default. To be able to use it in the example, it is set as a dependency of demo migration module.
A date and time field stores its value in
Y-m-d\TH:i:s format. Note it does not include a timezone. Instead,
UTC is assumed by default. In the example, the source column that contains the data is
src_datetime. An example value is
2019/12/24 19:15:30. Let’s assume that all dates are provided with a timezone value of
America/Managua. The following snippet shows how to do the transformation:
field_ud_datetime/value: plugin: format_date source: src_datetime from_format: 'Y/m/j H:i:s' to_format: 'Y-m-d\TH:i:s' from_timezone: 'America/Managua' to_timezone: 'UTC'
If you need the timezone to be dynamic, things get a bit harder. The
to_timezone settings expect a literal value. It is not possible to read a source column to set these configurations. An alternative is that your source column includes timezone information like
2019/12/24 19:15:30 -07:00. In that case, you would need to tweak the
from_format to include the timezone component and leave out the
Things to consider
Date migrations can be tricky because they can be affected by things outside of the Migrate API. Here is a non-exhaustive list of things to consider:
- For date and time fields, the transformation might be affected by your server’s timezone if you do not manually set the
- People might see the date and time according to the preferences in their user profile. That is, two users might see a different value for the same migrated field if their preferred timezones are not the same.
- For date only fields, the user might see a time depending on the format used to display them. A list of available formats can be found at
- A field can always be configured to be presented in a specific timezone. This would override the site’s timezone and the user’s preferred timezone.
What did you learn in today’s blog post? Did you know that entity properties and date fields expect different destination formats? Did you know how to do timezone conversions? What challenges have you found when migrating dates and times? Please share your answers in the comments. Also, I would be grateful if you shared this blog post with others.
This blog post series, cross-posted at UnderstandDrupal.com as well as here on Agaric.coop, is made possible thanks to these generous sponsors. Contact Understand Drupal if your organization would like to support this documentation project, whether it is the migration series or other topics.