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Virtually all data one might want to collect as part of doing personal science have some form of timestamp associated with it – that is: When was the data collected? Unfortunately handling dates & times isn't as straightforward as one might assume and the problem of correctly doing so is often only half-jokingly called one of computer sciences hardest problems. Why are dates & times hard? There's [https://www.zainrizvi.io/blog/falsehoods-programmers-believe-about-time-zones/ many reasons], including traveling across timezones and daylight saving time.{{Topic Infobox

Virtually all data one might want to collect as part of doing personal science have some form of timestamp associated with it – that is: When was the data collected? Unfortunately handling dates & times isn't as straightforward as one might assume and the problem of correctly doing so is often only half-jokingly called one of computer sciences hardest problems. Why are dates & times hard? There's [https://www.zainrizvi.io/blog/falsehoods-programmers-believe-about-time-zones/ many reasons], including traveling across timezones and daylight saving time.

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