node.js - if input maybe undefined how to use swig date filter -

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i use swig in nodejs project，when use date filter，i found this：

{{t.updateat|date('y-m-d h:i:s',-480)}} nan-nan-nan nan:nan:nan

because t.updateat undefined, when time need date filter output ''.

so, how can do? 

{% if t.updateat %}     {{t.updateat|date('y-m-d h:i:s',-480)}} {% endif %}

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