Add Day Of Week By Name For A Date as a postgres til

postgres/day-of-week-by-name-for-a-date.md

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+# Day Of Week By Name For A Date
+
+In [Day Of Week For A Date](day-of-week-for-a-date.md), I explained how to
+determine what day of the week a date is as an integer with PostgreSQL. This
+used the `date_part()` function. By using the `to_char()` function with a
+date or timestamp, we can determine the day of the week by name (e.g.
+Monday). For instance, to determine what day today is, try a statement like
+the following:
+
+```sql
+> select to_char(now(), 'Day');
+  to_char
+-----------
+ Sunday
+```
+
+The `Day` part of the second argument is just one of many template patterns
+that can be used for formatting dates and times.
+
+See [Data Type Formatting
+Functions](http://www.postgresql.org/docs/current/static/functions-formatting.html)
+in the Postgres docs for more details.