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i have several wordpress installations running on my servers. among them, there is one instance which is not publicly visible. it uses dates which are several decades in the past.
everything was working well when i last worked on that project, which is quite some time ago. but yesterday, when looking at it another time, i noticed something odd. the dates were all replaced with the current date (and time). wtf?
now, some debugging later, i found the culprit. that wordpress installation is in german (the only german one i have), and somewhere inside wordpress, a function called date_i18n is used in that case to translate a timestamp into a date, time, or whatever is requested. unfortunately (for me), this function (in Wordpress/wp-includes/functions.php) contains a “sanity check” for “php 5.1.0-”. in case the unix timestamp is negative, it is set to current time. and obviously, any date before january 1, 1970 will be turned into today.
commenting out these lines (or removing them) fixes the problem.

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