looking at app/lib/core/util.js it is currently only PHP but it should be really easy to add it in:
- find the formatDate function (line 141)
- add a w (anwhere in the yMdHhmsaAv bit) into the regular expression (line 157) e.g.
return format.replace(/([yMdHwhmsaAv])(\1+)?/g, part => {
-
add
case 'w': return w;to the end of the switch cases
-
Save and test
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