Difference between revisions of "Query Date Math"
(more to come) |
(→Restrictions) |
||
| Line 8: | Line 8: | ||
There are certain kinds of Query operations that can only be done on certain [[Query Field Types]] so it is often neccessary to convert data between field types to get the desired actions. | There are certain kinds of Query operations that can only be done on certain [[Query Field Types]] so it is often neccessary to convert data between field types to get the desired actions. | ||
| + | |||
| + | Query can only do date math on fields that are in the ISO Date data format. Many software packages store dates in some other format, so before doing Date Math on the contents of those fields, they need to be converted to IBM 400 ISO Date data format. This article will include example(s) of how to do that. | ||
Revision as of 09:17, 28 May 2005
See Query for links to more tips.
Introduction
Many Query users want to do date math, where we find out how many days ago some date was, or we select data based on including stuff for the last 7 days, and we not want to force the user to always have to key in whatever cut-off date to use. We would rather key in how many days to include, and let Query do the date math.
Restrictions
There are certain kinds of Query operations that can only be done on certain Query Field Types so it is often neccessary to convert data between field types to get the desired actions.
Query can only do date math on fields that are in the ISO Date data format. Many software packages store dates in some other format, so before doing Date Math on the contents of those fields, they need to be converted to IBM 400 ISO Date data format. This article will include example(s) of how to do that.
