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

Author: jbranchaud

README.md

@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
-_316 TILs and counting..._
+_317 TILs and counting..._
 
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@@ -137,6 +137,7 @@ _316 TILs and counting..._
 - [Create A Composite Primary Key](postgres/create-a-composite-primary-key.md)
 - [Create hstore From Two Arrays](postgres/create-hstore-from-two-arrays.md)
 - [Creating Conditional Constraints](postgres/creating-conditional-constraints.md)
+- [Day Of Week By Name For A Date](postgres/day-of-week-by-name-for-a-date.md)
 - [Day Of Week For A Date](postgres/day-of-week-for-a-date.md)
 - [Default Schema](postgres/default-schema.md)
 - [Defining Arrays](postgres/defining-arrays.md)

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

@@ -0,0 +1,22 @@
+# 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.