In the API request:
https://m.wikidata.org/w/api.php?action=wbgetentities&format=json&ids=Q937&languages=en&props=descriptions%7Cclaims

{"hash":"a7e5bfde15440144baab73befd6eaddd22e0df12","snaktype":"value","property":"P580","datatype":"time","datavalue":{"value":{"time":"+00000001879-03-14T00:00:00Z","timezone":0,"before":0,"after":0,"precision":11,"calendarmodel":"http://www.wikidata.org/entity/Q1985727"},"type":"time"}}]

is one of the responses.
Could this be supplemented with a human readable string e.g.
{
"time":"+00000001879-03-14T00:00:00Z",
"msg": "14th March 1879"

Currently a frontend dev has to write /lots of/ code to do the above (see https://gerrit.wikimedia.org/r/#/c/184811/7/javascripts/modules/infobox/Infobox.js) so it would be better to return this via the API in the requested language.