Zoneinfo is a MongoDB feature that allows you to store and query date and time information in a way that takes into account the time zone in which the date and time were recorded. This is important because dates and times are not absolute values, but are relative to the time zone in which they were recorded.
MongoDB supports the use of the IANA Time Zone Database, also known as the tz database, to handle time zone information. The tz database contains a comprehensive set of time zone information, including historical changes to time zones.
To use zoneinfo in MongoDB, you need to store the time zone information in a separate field along with the date and time information. You can then use the zone operator in your queries to retrieve data based on the time zone in which it was recorded.
For example, if you have a collection of events that were recorded in different time zones, you could use the following query to retrieve events that occurred between 9am and 10am Eastern Standard Time:
db.events.find({
start_time: { $gte: ISODate("2023-04-08T09:00:00-05:00") },
end_time: { $lt: ISODate("2023-04-08T10:00:00-05:00") },
time_zone: "America/New_York"
})
This query uses the ISODate constructor to create a date object with the specified time and time zone offset. The time_zone field specifies the time zone in which the event was recorded, and the query returns only events that occurred between 9am and 10am Eastern Standard Time.
Note that the time_zone field should be stored in the IANA Time Zone Database format, which is a string that identifies the time zone using a region/city format, such as “America/New_York” or “Europe/London”.