How to order custom posts by one of the custom fields value, ‘date’?

the best way

If you input the gig time as a unix timestamp (using strtotime()), then you can use WP_Query‘s meta_value_num in the orderby element to set the order. You can also use WP_Query‘s meta_query to only get posts that have a date that occur in the future.

the other way

If you can’t do this for some reason or another (probably that your date is already set), if you get all the gigs, you can reorder the array of posts based on a strtotime() of your meta value. This will be a heavier implementation performance wise, so go with the other one if possible.

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