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. 2019 May 22;21(5):e13047. doi: 10.2196/13047

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©Eric Steven Kirkendall, Yizhao Ni, Todd Lingren, Matthew Leonard, Eric S Hall, Kristin Melton. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 22.05.2019.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

PMC Copyright notice

Representation of different amounts of granularity and specificity in timestamps, ranging from year only to fractions of a second, and including timezone information. Content from the World Wide Web Consortium.