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How to quickly add hours/minutes/second to date and time in Excel?

Posted by jpluimers on 2020/11/11

Excel date times are almost identical to OLE/COM automation date times (that used in many Windows applications).

Which means that dates are 1 unit apart, and:

  • Weeks = 7
  • Days = 1
  • Hours = 1/24
  • Minutes = 1/(24*60) or 1/1440
  • Seconds = 1/(24*60*60) or 1/86400

That way you can easily add one hour to a date/time value by adding 1/24.

Source: How to quickly add hours/minutes/second to date and time in Excel?

Related:

–jeroen

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