Per legal, header files should use the following format for date ranges: "<year the file was created>-present". For example:

# Copyright 2009-present MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# ...

Replace 2009 with whatever year the file was created.

For documentation footers, the following text should be used:

© MongoDB, Inc 2008-present. MongoDB, Mongo, and the leaf logo are registered trademarks of MongoDB, Inc.

Replace 2008 with the inception year of the project.

Original description follows
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Different driver projects have different conventions for updating copyright dates in files:

• Never update the year (list year of first creation)
• Update the year in a file whenever the file is modified
• Update all the files to the current year every year

Should we have a common approach? Does it matter?

As a criteria: if it doesn't really matter, we should choose the approach that requires the least amount of work for engineers.