# Dateval field of Date object content **URL:** \ **Category:** Help\ **Tags:** third-party-addon, supertool-script\ **Created:** [December 18, 2021, 1:38pm UTC](https://gramps.discourse.group/t/dateval-field-of-date-object-content/2039 "2021-12-18T13:38:31Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![PLegoux](https://yyz2.discourse-cdn.com/free1/user_avatar/gramps.discourse.group/plegoux/32/413_2.png) [@PLegoux](https://gramps.discourse.group/u/PLegoux)\ **Post date:** [December 18, 2021, 1:38pm UTC](https://gramps.discourse.group/t/dateval-field-of-date-object-content/2039/1 "2021-12-18T13:38:31Z")
Using Supertool I’ve displayed the _dateval_ field content of Date objects. Could someone tell me what is the _ **False** _ last field of the dateval tupple? And what makes it to become True? ![image](https://global.discourse-cdn.com/free1/uploads/gramps/original/2X/b/b374c3c3dc3cdf9f40bfd7fedd2abc9fc11bff7a.jpeg) ([about that question (fr)](https://www.geneanet.org/forum/viewtopic.php?p=2099646#p2099646)) ---
**Author:** ![emyoulation](https://yyz2.discourse-cdn.com/free1/user_avatar/gramps.discourse.group/emyoulation/32/67_2.png) [@emyoulation](https://gramps.discourse.group/u/emyoulation)\ **Post date:** [December 18, 2021, 2:03pm UTC](https://gramps.discourse.group/t/dateval-field-of-date-object-content/2039/2 "2021-12-18T14:03:52Z")
Seems likely that `True` would be the dates generated by Gramps [Calculate Estimated Dates](https://gramps-project.org/wiki/index.php/Calculate_Estimated_Dates) tool (or other similar tools) as disposable placeholder dates. ---
**Author:** ![emyoulation](https://yyz2.discourse-cdn.com/free1/user_avatar/gramps.discourse.group/emyoulation/32/67_2.png) [@emyoulation](https://gramps.discourse.group/u/emyoulation)\ **Post date:** [December 18, 2021, 2:44pm UTC](https://gramps.discourse.group/t/dateval-field-of-date-object-content/2039/3 "2021-12-18T14:44:50Z")
That raises the question of whether the Gramps export tools are smart enough to strip off these guesswork dates? Guess it is back to the example.gramps to do a test series! ---
**Author:** ![prculley](https://yyz2.discourse-cdn.com/free1/user_avatar/gramps.discourse.group/prculley/32/41_2.png) [@prculley](https://gramps.discourse.group/u/prculley)\ **Post date:** [December 18, 2021, 5:30pm UTC](https://gramps.discourse.group/t/dateval-field-of-date-object-content/2039/4 "2021-12-18T17:30:26Z")
The last item in a Dateval is a boolean that indicates a “slash” formatted Julian date. From the wiki “And typing a slash after the year followed by a value 1 year later creates a Julian dual dated entry.” From the code; “Slash date is given as year1/year2, where year1 is Julian year, and year2=year1+1 the Gregorian year. If slash is True, then the date is in the form of 1530/1” I’m not personally familiar with this type of dating, so I an not too clear on how this is used. Paul C. ---
**Author:** ![emyoulation](https://yyz2.discourse-cdn.com/free1/user_avatar/gramps.discourse.group/emyoulation/32/67_2.png) [@emyoulation](https://gramps.discourse.group/u/emyoulation)\ **Post date:** [December 18, 2021, 10:23pm UTC](https://gramps.discourse.group/t/dateval-field-of-date-object-content/2039/5 "2021-12-18T22:23:22Z")
> [@prculley](#): > > The last item in a Dateval is a boolean that indicates a “slash” formatted Julian date. Ok. Good info. Do you know how the generated dates are marked? When I did tests a couple years ago, it was smart enough to recalculate estimates where new data allowed more fine tuning. So it seems like it must be tested somehow. ---
**Author:** ![dlynch](https://avatars.discourse-cdn.com/v4/letter/d/848f3c/32.png) [@dlynch](https://gramps.discourse.group/u/dlynch)\ **Post date:** [December 19, 2021, 9:20pm UTC](https://gramps.discourse.group/t/dateval-field-of-date-object-content/2039/6 "2021-12-19T21:20:36Z")
Until 1752 in England and Wales, officially, the year went from 25 Mar to 24 Mar. The next day after 31 Dec 1699 was 1 Jan 1699/00. Ordinary people tended to count from 1 Jan. Documents and transcriptions for dates between 1 Jan and 14 Mar are often ambiguous or mistaken. The dual dating option in Gramps enables clarity. David Lynch ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/gramps/original/1X/2ac1e712b7adf612e31ca08a55419f4cf37c0158.png) [@system](https://gramps.discourse.group/u/system)\ **Post date:** [January 18, 2022, 9:20pm UTC](https://gramps.discourse.group/t/dateval-field-of-date-object-content/2039/7 "2022-01-18T21:20:43Z")
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