Custom post types – meta_query: search lesson which starts sooner

I would advice you to store the time as a string instead of a d-m-Y format. Use strtotime() to format it as a long integer. This will help you comparing the strings. I’m not 100% sure if PHP is able to compare string dates. It is however able to compare timetamps as this user mentioned as well: How to compare dates and strings in PHP

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