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== Where used? ==
If the date is textual, the text of the date as entered is matched with the textual date.
If the date is a correct date, the dates are compared. If part of the date corresponds with part of the date you want to match with, the match is considered successfullsuccessful.
Matching is as follows:
Special cases:
* [[Dates#Dual_Dated|mixed date]]: eg <abbr title="exempli gratia - Latin phrase meaning 'for example'">e.g.</abbr> 1735/6-12-12, as the meaning of this is 1736-12-12 in Gregorian calendar, 1736-12-12 is used with the above mentioned rules.
== Changing after/before/about range ==
The values for the typical ages at birth, between generations, etc., can be set in the {{man menu|Menu -> Edit -> Preferences -> [[Gramps_5.2_Wiki_Manual_-_Settings#Limits|Limits > Calculation limits]]}} tab or you can manually change it as described below. {{man warn|You can only change the following configuration file|<code>~/.gramps/gramps.ini</code><br><br>'''if Gramps is not running.'''}} The date ranges taken used by gramps Gramps are set by keys. These If not present these keys can be added to your <ttcode>~/.gramps/keysgramps.ini</ttcode> file. Eg<abbr title="exempli gratia - Latin phrase meaning 'for example'">e.g.</abbr>, you could add to the <tt>behavior</tt> group:
[behavior]
;;date-beforeabout-range=999950 ;;date-after-range=999950 ;;date-aboutbefore-range=10 These are the default values. If you want to ahve that before only reaches back 100 years on matches, give instead:50
Those are the default values. If you want to have that before only reaches back 100 years on matches, remove the double semicolons before them makes Gramps ignore them and change the numbers to match this:
[behavior]
date-about-range=10
date-after-range=50
date-before-range=100