Quick Start: BSON Data Types - Date

Working with dates and times can be a challenge. The Date BSON data type is an unsigned 64-bit integer with a UTC (Universal Time Coordinates) time zone.

Dates and times in programming can be a challenge. Which Time Zone is the event happening in? What date format is being used? Is it MM/DD/YYYY or DD/MM/YYYY? Settling on a standard is important for data storage and then again when displaying the date and time. The recommended way to store dates in MongoDB is to use the BSON Date data type.

The BSON Specification refers to the Date type as the UTC datetime and is a 64-bit integer. It represents the number of milliseconds since the Unix epoch, which was 00:00:00 UTC on 1 January 1970. This provides a lot of flexibilty in past and future dates. With a 64-bit integer in use, we are able to represent dates roughly 290 million years before and after the epoch. As a signed 64-bit integer we are able to represent dates prior to 1 Jan 1970 with a negative number and positive numbers represent dates after 1 Jan 1970.

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