"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.
This is a special property that every page has, which is the date of the last time it was edited. See here for more.
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02:03:33, 17 March 2018 +
22:16:17, 10 April 2019 +
_chathead.png){kind=link}
-20chathead.png){kind=link}
21:26:06, 12 June 2017 +
_location.png){kind=link}
-20location.png){kind=link}
17:57:29, 20 June 2017 +
.png){kind=link}
.png){kind=link}
04:07:25, 9 June 2017 +
21:23:13, 10 April 2019 +
03:35:22, 8 September 2015 +
18:01:44, 20 June 2017 +
17:33:28, 17 August 2013 +
21:23:16, 10 April 2019 +
19:51:27, 23 July 2015 +
21:23:15, 10 April 2019 +
03:35:23, 8 September 2015 +
21:23:07, 10 April 2019 +
19:50:54, 23 July 2015 +
18:01:46, 20 June 2017 +
17:19:51, 17 August 2013 +
21:21:58, 10 April 2019 +
23:11:30, 25 May 2014 +
16:15:33, 1 January 2015 +
20:00:54, 10 April 2019 +
13:10:44, 23 April 2018 +
20:00:47, 10 April 2019 +
13:10:45, 23 April 2018 +
20:01:00, 10 April 2019 +
13:10:56, 23 April 2018 +
20:00:41, 10 April 2019 +
13:11:49, 23 April 2018 +
20:00:36, 10 April 2019 +
13:11:15, 23 April 2018 +
20:01:06, 10 April 2019 +
13:11:25, 23 April 2018 +
21:12:58, 10 April 2019 +
17:42:59, 20 June 2017 +
20:33:50, 14 September 2015 +
13:02:53, 22 September 2015 +
21:23:01, 10 April 2019 +
16:20:51, 1 January 2015 +
22:07:20, 10 April 2019 +
17:00:08, 15 September 2015 +
18:26:13, 20 June 2017 +
20:35:06, 25 March 2015 +
16:20:52, 1 January 2015 +
20:33:52, 14 September 2015 +
13:13:30, 22 September 2015 +
20:33:52, 14 September 2015 +
13:31:27, 22 September 2015 +
21:23:05, 10 April 2019 +
03:35:24, 8 September 2015 +