HOWTO: How to Add or Subtract Time with a DateTime Data Type

 Last reviewed: November 11, 1997
Article ID: Q176043
The information in this article applies to:
  • Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b,5.0, 5.0a
  • Microsoft Visual FoxPro for Macintosh, version 3.0b

SUMMARY

This article describes how to add or subtract time with a DateTime field. Time, in seconds, can be added or subtracted with a DateTime data type field. Time carries over from seconds to minutes to hours to days and to years. There are no adjustments in this sample for a leap year. This is an example and you may want to add additional functionality if time calculations are a large part of your application.

MORE INFORMATION

When you add or subtract time with a DateTime field, the value(s) to add or subtract will be calculated with seconds.

Example to add an hour: 

   HourFromNow = Datetime() + 3600
-or-

Example to subtract a week: 

   WeekAgo = Datetime() – (7*24*3600)

Additional query words: datetime day hour minute second hh:mm:ss
(c) Microsoft Corporation, 1997, All Rights Reserved. Contributions by
Mike Fernald,
Microsoft Corporation
Keywords : VFoxMac vfoxwin
Version : MACINTOSH:3.0b; WINDOWS:3.0,3.0b,5.0,5.0a
Platform : MACINTOSH WINDOWS
Issue type : kbhowto

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last reviewed: November 11, 1997
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.