How can I only show a widget prior to a specific date?

I assume you would like to do this through the WordPress admin and not edit your sidebar.php so here is a possible solution.

First, find out what the timestamp of August 22 was at http://www.epochconverter.com. Based on GMT time I got “1408665600”

Install the Widget Logic Plugin: https://wordpress.org/plugins/widget-logic/

Add a widget to your left sidebar. If you wanted it to be a message then a text widget might work best.

In the widget logic box of the widget, try something like the below:

get_the_date('U') <= "1408665600"

It’s saying to show the widget if the Unix timestamp of the post’s publish date is less (earlier) than or equal to the Unix timestamp of August 22, 2014.

If your widget area is shared over multiple pages and/or post types then you can also restrict it to only show when the above matches as well as the post type, something like:

get_post_type() == 'post' && get_the_date('U') <= "1408665600"

Hope that helps.

Related Posts:

  1. Customizing wordpress default widgets?
  2. Code for Recent Posts Widget
  3. Modifying the default search widget
  4. Is there a way to add more tags to the tag cloud?
  5. Modify recent post sidebar to show post thumbs with out plugins
  6. How to build widget with arrays inside arrays?
  7. How do I save data from submitted form from widget
  8. Why Can’t wp_editor Be Used in a Custom Widget?
  9. How to listen to color changes on the color picker?
  10. Add New Footer Widget Area with Limited Options?
  11. Add div class to only one widget
  12. How to use control_callback when creating a widget via functions.php or plugin?
  13. Updating to Version 4.5 bumped my “main sidebar” widget out of place
  14. How can I delete all inactive widgets?
  15. Call sidebar from a template
  16. Widget Area: Modify $param[‘xy’] from widget-$n
  17. Widget area inside a widget
  18. Defer Code in Widgets – Page Speed
  19. Where are widget configurations stored?
  20. How to limit wp_get_archives to show months for the X years only
  21. Bolding specific word(s)/parts of widget title
  22. Adding a widget to a string of HTML
  23. How to add a class to a link in text editor
  24. WordPress widget new instance creates content duplicates
  25. Pass variables from one widget to another widget
  26. Remove the widgets tab from theme customizer
  27. Remove/Add widgets from/to the Available Widgets pool
  28. Remove/Unregister or hide a widget added by a plugin
  29. How can I apply css styling to the current day in the calendar widget
  30. How to check if a widget has no title
  31. AJAX Contact Form Issue
  32. Including PHP files doesn’t work outside of Localhost
  33. Is there an official email form widget or block?
  34. Widget html code error
  35. Display sidebar only if it has content
  36. Post-specific widgets in WordPress ‘Twenty Fourteen’ theme
  37. Excluding specific widgets from default sidebar class
  38. How to truncate titles in Recent Posts widget?
  39. Can WordPress Read Its Own RSS Feed?
  40. Can’t see widget areas in my customizer
  41. Display custom widget, added as a shortcode in the correct place
  42. Show posts from one category with thumbnail and description on latest
  43. Widget textarea input gets formatted
  44. Show widget differently depending on if it’s in the sidebar or footer
  45. Enqueue script/style if certain widget has certain value
  46. How to display/register widget only on post pages in custom plugin
  47. Is it possible to display tag cloud widget by category?
  48. Widgets not saving values
  49. How to use a dropdown to populate a list of post from CPT
  50. Fire on widgets_init only on dashboard
  51. Access Customizer widget instance form
  52. Allow shortcode for custom widget
  53. One register_sidebar function works, the other doesn’t?
  54. WordPress widget title coding
  55. Text Widget in Footer for just 1 page template
  56. Modify WordPress widgets Screen
  57. What does apply_filters() do exactly? [duplicate]
  58. How to change color of registered widget areas in admin?
  59. Filter Text from sidebar widget?
  60. How to filter widget(s) based on a specific category landing page
  61. How do I remove/reset all current widgets from the database?
  62. Search transients through widget
  63. what is the difference between these two types of widget form method
  64. Change the background color of my theme widgets
  65. Output column number according to active sidebars
  66. Instance not inserting data for widget
  67. Why would apply_filters return a non-empty string, when the value returned is empty?
  68. How to customize wordpress sidebar widget
  69. Jquery checkbox -show posts with checked tags
  70. Preset Widgets ONLY after site is initially created
  71. How to translate widget titles in 2021 theme?
  72. Is it possible to add a preview to custom developed Widget?
  73. How to enable [archives] short code
  74. Where does the removing of widget through appearance – customize take affect
  75. Widget editing returns JSON response error
  76. Allow users to give a dashboard widget a custom name using ACF
  77. Why does my $instance within a custom widget return empty (undefined index)?
  78. How to move widget area to another section in WordPress Customizer
  79. Handling dozens of sidebars
  80. I cannot customize custom widgets anymore after moving WordPress website
  81. widget that will do shortcodes that user inputs
  82. Disable wordpress widget automatically on error
  83. Can I add a widget to the of my site?
  84. Widget dynamically add new input field
  85. Widget Development – Displaying dropdown content
  86. WordPress function breaks widget’s markup?
  87. Registering multiple copies of a widget
  88. How do I stop out of stock items from appearing on my WooCommerce site when using the Layered Nav widget [closed]
  89. Single Widget Multi Sidebar
  90. An issue with register_sidebar and the admin interface
  91. menu in different page in different style
  92. Add text to Text Widget using Javascript
  93. Widget on home page displays wrong time compared to same widget on inside pages
  94. Widget logic not working
  95. Subpages menu on sidebar plus widgets
  96. Widgets in PHP files?
  97. Text Widget Not Working
  98. Sample widget code which get data(1-5 record) from Wp_Admin panel and display to Homepage(WordPress Custom Theme)
  99. Unable to add options on dashboard widget ?
  100. is it possible to create custom widgets page in admin?