Add to_iso_date

snippets/to_iso_date.md

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+---
+title: to_iso_date
+tags: date,intermediate
+---
+
+Converts a date to its ISO-8601 represenation.
+
+- Use `datetime.datetime.isoformat()` to convert the given `datetime` object to an ISO-8601 date.
+
+```py
+from datetime import datetime
+
+def to_iso_date(d):
+  return d.isoformat()
+```
+
+```py
+from datetime import datetime
+
+to_iso_date(datetime(2020,10,25)) # 2020-10-25T00:00:00
+```