I think management need to read the following definition. Continuously moving the date doesn't make it a deadline, it just makes it ridiculous.
deadline
ˈdɛdlʌɪn/ noun
1.
the latest time or date by which something should be completed.
"the deadline for submissions is Friday 5th February"
synonyms: time limit, limit, finishing date, finishing time, target date, target time, cut-off point
"they stipulated a deadline for the army's withdrawal"
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