Instead of displaying the exact date your post was published, you can display it relatively – “6 months ago” or “3 weeks ago”. Use the following code to do this:
# For posts & pages #
<?php echo human_time_diff(get_the_time('U'), current_time('timestamp')) . ' ago'; ?>
# For comments #
<?php echo human_time_diff(get_comment_time('U'), current_time('timestamp')) . ' ago'; ?>For another useful date/time display, see Display Estimated Post Reading Time.