Terry Chay

<a href="http://terrychay.com/wordpress-plugins/blog-birthday" rel="nofollow ugc">Plugin Homepage</a>
Inspired by @TwBirthday on Twitter, this shows a simple message in the admin panel on 
their blog birthday.
“Happy 3rd Blogger Birthday! You’ve been around since 11 August 2008.”
“Happy 7th Blog Birthday! The first post on this blog was on 19 November 2004.”
“Happy 1st Blog Birthday! This blog was first registered on 23 July 2010.”
Caveats: 
– Old WordPress admin accounts have a registration date of 0000-00-00 and never have a 
 blogger birthday. 
– Blog registration starts when you turn on WordPress multisite. If you did this, the 
 date may be off. 
– First post assumes that there a post_id=1 and uses the date off that.
<h3>Future Features</h3>
<ul>
<li>Add ability to change the blogger birthday if blank</li>
<li>Add ability to change the blog registration date if first post is different.</li>
<li>4567890012345678900123456789001234567890012345678900123456789001234567890012345678900</li>
</ul>

Blog Birthday

Show a user a notification on their blog birthday.

This plugin allows you to enter and manage different kinds of events that you then display in via a widget or shortcodes.
<h3>Shortcodes</h3>
There are two shortcodes. <code>[tdih]</code> shows output as a list similar to the widget and <code>[tdih_tab]</code> shows output as a table.
<h4>tdih</h4>
You can add a <code>[tdih]</code> shortcode to any post or page to display a list of events as per the widget.
There are eleven optional attributes for this shortcode
<ul>
<li>show_age (0, 1) – 1 shows the age in years of the event in brackets after the title and 0 does not (default).</li>
<li>show_link (0-2) – 0 shows a more link if there is more to show (default), 1 links the title if there is more to show and 2 always links the title.</li>
<li>show_type (0, 1) – 1 shows event types (default) and 0 does not.</li>
<li>
show_year (0, 1) – 1 shows the year of the event (default) and 0 does not.
</li>
<li>
type – enter a type to show only events of that type. Shows all types by default.
</li>
<li>day (1-31) – enter a day to show only events on that day. Shows all days by default.</li>
<li>month (1-12, c) – enter a month to show only events in that month. Shows all months by default.</li>
<li>year (-9999 to 9999, 0) – enter a year to show only events in that year. Shows all years by default.</li>
<li>period (t, m, y) – show events for today, tomorrow and yesterday. Shows today’s events by default.</li>
<li>classes – enter one or more space separated classes which will be added to the table tag.</li>
<li>max_rows (1-99) – enter a maximum number of events to show. Shows all events by default.</li>
</ul>
Example use:
<ul>
<li><code>[tdih]</code> – This shows year and event types for all event types for today’s events.</li>
<li><code>[tdih show_type=0 type='birth']</code> – This shows year and event but not type for the event type (slug) of birth.</li>
<li><code>[tdih year=1066 max_rows=5]</code> – This shows year and event types for up to five events that happened on this day in 1066.</li>
</ul>
<h4>tdih_tab</h4>
You can add a <code>[tdih_tab]</code> shortcode to any post or page to display a table of events.
There are fourteen optional attributes for this shortcode:
<ul>
<li>show_date (0, 1) – 1 shows the date (default) and 0 does not.</li>
<li>show_dow (0, 1) – 1 shows the day of the week and 0 does not (default).</li>
<li>show_head (0, 1) – 1 shows a header row (default) and 0 does not.</li>
<li>show_link (0, 1, 2) – 0 shows a more link if there is more to show, 1 links the title if there is more to show and 2 always links the title.</li>
<li>
show_type (0, 1) – 1 shows event types (default) and 0 does not.
</li>
<li>
order_dmy (0, 1) – 0 sorts chronologically by year-month-day (default) and 1 sorts by day-month-year.
</li>
<li>type – enter a type to show only events of that type. Shows all types by default.</li>
<li>day (1-31) – enter a day to show only events on that day. Shows all days by default.</li>
<li>month (1-12, c) – enter a month to show only events in that month. Shows all months by default.</li>
<li>year (-9999 to 9999, 0) – enter a year to show only events in that year. Shows all years by default.</li>
<li>period (a, c, l, m, n, t, w, y) – t, m, y show events for today, tomorrow and yesterday. c, l, n, w show events for current, last, next and ISO week. a show all events. Shows today’s events by default.</li>
<li>period_days (1-99) – enter the number of days to show for t, m, y periods only. Shows only one day by default.</li>
<li>date_format – enter a custom <a href="https://www.php.net/manual/en/function.date.php" rel="nofollow ugc">php date format</a> to display the date. Uses the tdih admin setting by default.</li>
<li>classes – enter one or more space separated classes which will be added to the table tag.</li>
</ul>
NB:
<ul>
<li>day of the week will never be shown if the date is not shown.</li>
<li>Setting date_format will override the tdih admin format and the day of the week setting.</li>
<li>Setting period will override any values for day, month and year.</li>
<li>day, month and year can be combined.</li>
<li>year=0 will display events with no year</li>
<li>month=c will display the current month</li>
<li>period=c, l or n show a seven day period with the current day as the middle, last or first day.</li>
</ul>
Example use:
<ul>
<li><code>[tdih_tab period='a']</code> – This shows a full list of events in date order and includes the event type.</li>
<li><code>[tdih_tab show_types=0 type='birth' classes='content dark']</code> – This shows events but not type for the event type (slug) of birth. ” content dark” will be added to the table’s class.</li>
<li><code>[tdih_tab day=20 month=8 date_format='Y']</code> – This shows events on 20th August in any year. Format the date to only show the four digit year.</li>
</ul>

This Day In History

Magnificent

This "On This Day" plugin allows you to enter historic or future events and display them via the included widget and shortcodes.

Blog Birthday vs This Day In History