| 10 Apr 2021 | Ultimate Calendar 1.8.1.2 Final (Update 3) released | |
| 10 Apr 2021 | Added language: Bulgarian (Български) | |
| 10 Apr 2021 | Added generic dates set: “Празници в България”, language: Bulgarian (Български) | |
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| 30 Jun 2018 | Updated language: Czech (Čeština) | |
| 30 Jun 2018 | Updated language: Slovak (Slovenčina) | |
| 30 Jun 2018 | Updated generic dates set: “ČR: Státní svátky ČR”, language: Czech (Čeština) | |
| 30 Jun 2018 | Updated generic dates set: “ČR: Tradiční české svátky”, language: Czech (Čeština) | |
| 30 Jun 2018 | Ultimate Calendar 1.8.1.2 Final (Update 2) released | |
| 11 Jan 2018 | Added additional dates set (website): “Mednarodni in svetovni dnevi”, language: Slovenian (Slovenski) | |
| 11 Jan 2018 | Added additional dates set (website): “Znaki zodiaka”, language: Slovenian (Slovenski) | |
| 11 Jan 2018 | Updated generic dates set: “Prazniki v Sloveniji”, language: Slovenian (Slovenski) | |
| 11 Jan 2018 | Ultimate Calendar 1.8.1.2 Final (Update 1) released | |
| 02 Jan 2018 | Ultimate Calendar 1.8.1.2 Final released | |
| 25 Dec 2017 | Updated generic dates set: “Свята України”, language: Ukrainian (Українська) | |
| 25 Dec 2017 | Ultimate Calendar 1.8.1.1 Final (Update 2) released | |
| 11 Sep 2016 | Added generic dates set: “დღესასწაულები”, language: Georgian (ქართული) | |
| 11 Sep 2016 | Ultimate Calendar 1.8.1.1 Final (Update 1) released | |
| 06 Feb 2016 | Added language: Arabic (عربي) | |
| 06 Feb 2016 | Ultimate Calendar 1.8.1.1 Final released | |
| 31 Jan 2016 | Ultimate Calendar 1.8.1.0 Final released | |
| 21 Nov 2015 | Added generic dates set: “Festividades Peru”, language: Spanish (Español) | |
| 21 Nov 2015 | Ultimate Calendar 1.8.0.0 Final (Update 2) released | |
| 17 Jul 2015 | Updated language file : Belarusian (Беларуская) | |
| 08 May 2015 | Updated generic dates set: “Свята України”, language: Ukrainian (Українська) | |
| 10 Feb 2015 | Added generic dates set: “UK Holidays”, language: English | |
| 10 Feb 2015 | Ultimate Calendar 1.8.0.0 Final (Update 1) released | |
| 10 Aug 2014 | Ultimate Calendar 1.8.0.0 Final released | |
| 28 Jul 2014 | Ultimate Calendar 1.8.0.0 RC 2.3 released | |
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| 23 Jul 2014 | Updated language file (version 1.8.0.0 only): French (Français) | |
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| 07 Jun 2014 | Ultimate Calendar 1.8.0.0 RC 2.2 released | |
| 29 May 2014 | Ultimate Calendar 1.8.0.0 RC 2.1 released | |
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| 28 May 2014 | Added additional dates set (website): “Csillagjegyek”, language: Hungarian (Magyar) | |
| 27 May 2014 | Added generic dates set: “Magyar ünnepek”, language: Hungarian (Magyar) | |
| 27 May 2014 | Added language: Hungarian (Magyar) | |
| 27 May 2014 | Ultimate Calendar 1.7.0.0 Final (Update 7) released | |
| 11 May 2014 | Ultimate Calendar 1.8.0.0 RC 2.0 released | |
| 10 May 2014 | Added additional dates set (website): “Personalitati romanesti”, language: Romanian (Romana) | |
| 26 Apr 2014 | Ultimate Calendar 1.8.0.0 RC 1.0 released | |
| 31 Mar 2014 | Added generic dates sets for Slovakia, language: Slovak (Slovenčina) | |
| 31 Mar 2014 | Added language: Slovak (Slovenčina) | |
| 31 Mar 2014 | Ultimate Calendar 1.7.0.0 Final (Update 6) released | |
| 30 Mar 2014 | Ultimate Calendar 1.8.0.0 Beta 4.5.5 released | |
| 27 Mar 2014 | Added additional dates set (website): “Zverokruh”, language: Slovak (Slovenčina) | |
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| 17 Mar 2014 | Added generic dates sets for Czech Republic, language: Czech (Čeština) | |
| 17 Mar 2014 | Added language: Czech (Čeština) | |
| 17 Mar 2014 | Added help, language: Romanian (Romana) | |
| 17 Mar 2014 | Ultimate Calendar 1.7.0.0 Final (Update 5) released | |
| 16 Mar 2014 | Added additional dates set (website): “Zvěrokruh”, language: Czech (Čeština) | |
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| 16 Mar 2014 | Ultimate Calendar 1.8.0.0 Beta 4.5.1 released | |
| 14 Mar 2014 | Ultimate Calendar 1.8.0.0 Beta 4.5.0 released | |
| 04 Mar 2014 | Added generic dates set: “Romania”, language: Romanian (Romana) | |
| 04 Mar 2014 | Added language: Romanian (Romana) | |
| 04 Mar 2014 | Ultimate Calendar 1.7.0.0 Final (Update 4) released | |
| 01 Mar 2014 | Ultimate Calendar 1.8.0.0 Beta 4.0.0 released | |
| 14 Feb 2014 | Ultimate Calendar 1.8.0.0 Beta 3.5.0 released | |
| 20 Jan 2014 | Ultimate Calendar 1.8.0.0 Beta 3.0.0 released | |
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| 20 Dec 2013 | Added generic dates set: “Prazniki v Sloveniji”, language: Slovenian (Slovenski) | |
| 20 Dec 2013 | Added language: Slovenian (Slovenski) | |
| 20 Dec 2013 | Ultimate Calendar 1.7.0.0 Final (Update 3) released | |
| 18 Dec 2013 | Ultimate Calendar 1.8.0.0 Beta 2.5.0 released | |
| 15 Dec 2013 | Added generic dates set: “Polskie święta”, language: Polish (Polski) | |
| 15 Dec 2013 | Added language: Polish (Polski) | |
| 15 Dec 2013 | Ultimate Calendar 1.7.0.0 Final (Update 2) released | |
| 12 Dec 2013 | Added additional dates set (website): “Zodiak”, language: Polish (Polski) | |
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| 28 Sep 2013 | Ultimate Calendar 1.7.0.0 Final (Update 1) released | |
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| 09 Sep 2013 | Updated additional dates set (website): “Знаки зодіаку”, language: Украинский (Українська) | |
| 27 Aug 2013 | Ultimate Calendar 1.7.0.0 Final released | |
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| 27 Jun 2013 | Added generic dates set: “Eesti puhad ja tahtpaevad”, language: Estonian (Eesti) | |
| 27 Jun 2013 | Added additional dates set (release): “Eesti lipupaevad”, language: Estonian (Eesti) | |
| 27 Jun 2013 | Added additional dates set (release): “Luhendatud toopaevad Eestis”, language: Estonian (Eesti) | |
| 27 Jun 2013 | Supplemented with religious holidays generic dates set “Свята України”, language: Ukrainian (Українська) | |
| 27 Jun 2013 | Ultimate Calendar 1.6.0.0a Final (Update 2) released | |
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| 13 Jun 2013 | Added additional dates set (website): “Tekens van de Dierenriem”, language: Dutch (Nederlands) | |
| 13 Jun 2013 | Added generic dates set: “België”, language: Dutch (Nederlands) | |
| 13 Jun 2013 | Ultimate Calendar 1.6.0.0a Final (Update 1) released | |
| 12 Jun 2013 | Added language: Dutch (Nederlands) | |
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| 28 Apr 2013 | Updated language file: Italian (Italiano) | |
| 24 Feb 2013 | Ultimate Calendar 1.6.0.0a Final released | |
| 18 Feb 2013 | Updated language file: German (Deutsch) | |
| 17 Feb 2013 | Updated generic dates set: “Deutsch (Sachsen/Deutschland)”, language: German (Deutsch) | |
| 17 Feb 2013 | Ultimate Calendar 1.6.0.0 Final released | |
| 18 Dec 2012 | Added generic dates set: “Државни празници на Република Македонија”, language: Macedonian (Македонски) | |
| 20 Nov 2012 | Ultimate Calendar 1.5.1.7 Final released | |
| 10 Nov 2012 | Updated generic dates set: “Praznici u Srbiji”, language: Serbian (Srpski) | |
| 29 Oct 2012 | Added generic dates set: “Deutsch (Sachsen/Deutschland)”, language: German (Deutsch) | |
| 29 Oct 2012 | Ultimate Calendar 1.5.1.5 Final released | |
| 14 Oct 2012 | The program is now completely free | |
| 14 Oct 2012 | Added generic dates set: “Deutsch (Sachsen/Deutschland)”, language: German (Deutsch) | |
| 14 Jul 2012 | Added generic dates set: “Հայաստանի տոները”, language: Armenian (Հայերեն) | |
| 14 Jul 2012 | Added language: Armenian (Հայերեն) | |
| 28 May 2012 | Added additional dates set (release): “Norske Flaggdager”, language: Norwegian (Norsk) | |
| 28 May 2012 | Added generic dates set: “Norwegian”, language: Norwegian (Norsk) | |
| 14 May 2012 | Added generic dates set: “Nederlands”, language: Dutch (Nederlands) | |
| 25 Apr 2012 | Ultimate Calendar 1.5.1 Final released | |
| 21 Sep 2011 | Ultimate Calendar 1.5 Final released | |
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| 30 Mar 2010 | Added language: Spanish (Español) | |
| 08 Mar 2010 | Ultimate Calendar 1.1 Final released | |
| 10 Dec 2009 | Added language: Croatian (Hrvatski) | |
| 08 May 2009 | Added language: Hebrew (עברית) | |
| 29 Apr 2009 | Ultimate Calendar 1.0 Final released | |