Version 1.7.4

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: lubridate
 Type: Package
-Version: 1.7.3
+Version: 1.7.4
 Title: Make Dealing with Dates a Little Easier
 Description: Functions to work with date-times and time-spans: fast and user
     friendly parsing of date-time data, extraction and updating of components of

NEWS.md

@@ -1,5 +1,5 @@
-Version 1.7.3.9000
-==================
+Version 1.7.4
+=============
 
 ### NEW FEATURES
 
@@ -14,6 +14,7 @@ Version 1.7.3.9000
 ### BUG FIXES
 
 * [#664](https://github.com/tidyverse/lubridate/issues/664) Fix lookup of period functions in `as.period`
+* [#649](https://github.com/tidyverse/lubridate/issues/664) Fix system timezone memoization
 
 Version 1.7.3
 =============

README.Rmd

@@ -19,15 +19,15 @@ library(lubridate)
 [![Build Status](https://travis-ci.org/tidyverse/lubridate.svg?branch=master)](https://travis-ci.org/tidyverse/lubridate)
 [![Coverage Status](https://codecov.io/gh/tidyverse/lubridate/branch/master/graph/badge.svg)](https://codecov.io/gh/tidyverse/lubridate)
 [![CRAN RStudio mirror downloads](http://cranlogs.r-pkg.org/badges/lubridate)](https://cran.r-project.org/package=lubridate)
-[![Development version](https://img.shields.io/badge/devel-1.6.0.9000-orange.svg)](https://github.com/tidyverse/lubridate)
+[![Development version](https://img.shields.io/badge/devel-1.7.4.9000-orange.svg)](https://github.com/tidyverse/lubridate)
 [![CRAN version](http://www.r-pkg.org/badges/version/lubridate)](https://cran.r-project.org/package=lubridate)
 
 ## Overview
 
-Date-time data can be frustrating to work with in R. R commands for date-times are generally unintuitive and change depending on the type of date-time object being used. Moreover, the methods we use with date-times must be robust to time zones, leap days, daylight savings times, and other time related quirks, and R lacks these capabilities in some situations. Lubridate makes it easier to do the things R does with date-times and possible to do the things R does not. 
+Date-time data can be frustrating to work with in R. R commands for date-times are generally unintuitive and change depending on the type of date-time object being used. Moreover, the methods we use with date-times must be robust to time zones, leap days, daylight savings times, and other time related quirks, and R lacks these capabilities in some situations. Lubridate makes it easier to do the things R does with date-times and possible to do the things R does not.
 
-If you are new to lubridate, the best place to start is the 
-[date and times chapter](http://r4ds.had.co.nz/dates-and-times.html) in R 
+If you are new to lubridate, the best place to start is the
+[date and times chapter](http://r4ds.had.co.nz/dates-and-times.html) in R
 for data science.
 
 
@@ -47,22 +47,22 @@ devtools::install_github("tidyverse/lubridate")
 
 ## Features
 
-*   Easy and fast parsing of date-times: `ymd()`, `ymd_hms`, `dmy()`, `dmy_hms`, 
+*   Easy and fast parsing of date-times: `ymd()`, `ymd_hms`, `dmy()`, `dmy_hms`,
     `mdy()`, ...
-    
+
     ```{r}
     ymd(20101215)
     mdy("4/1/17")
     ```
 
 *   Simple functions to get and set components of a date-time, such as `year()`,
     `month()`, `mday()`, `hour()`, `minute()` and `second()`:
-    
+
     ```{r}
     bday <- dmy("14/10/1979")
     month(bday)
     wday(bday, label = TRUE)
-    
+
     year(bday) <- 2016
     wday(bday, label = TRUE)
     ```
@@ -72,10 +72,10 @@ devtools::install_github("tidyverse/lubridate")
     ```{r}
     time <- ymd_hms("2010-12-13 15:30:30")
     time
-    
+
     # Changes printing
     with_tz(time, "America/Chicago")
-    
+
     # Changes time
     force_tz(time, "America/Chicago")
     ```
@@ -84,7 +84,7 @@ Lubridate also expands the type of mathematical operations that can be performed
 
 * `durations`, which measure the exact amount of time between two points
 
-* `periods`, which accurately track clock times despite leap years, leap 
+* `periods`, which accurately track clock times despite leap years, leap
   seconds, and day light savings time
 
 * `intervals`, a protean summary of the time information between two points

README.md

@@ -3,7 +3,7 @@
 lubridate <img src="man/figures/logo.png" align="right" />
 ==========================================================
 
-[![Build Status](https://travis-ci.org/tidyverse/lubridate.svg?branch=master)](https://travis-ci.org/tidyverse/lubridate) [![Coverage Status](https://codecov.io/gh/tidyverse/lubridate/branch/master/graph/badge.svg)](https://codecov.io/gh/tidyverse/lubridate) [![CRAN RStudio mirror downloads](http://cranlogs.r-pkg.org/badges/lubridate)](https://cran.r-project.org/package=lubridate) [![Development version](https://img.shields.io/badge/devel-1.6.0.9000-orange.svg)](https://github.com/tidyverse/lubridate) [![CRAN version](http://www.r-pkg.org/badges/version/lubridate)](https://cran.r-project.org/package=lubridate)
+[![Build Status](https://travis-ci.org/tidyverse/lubridate.svg?branch=master)](https://travis-ci.org/tidyverse/lubridate) [![Coverage Status](https://codecov.io/gh/tidyverse/lubridate/branch/master/graph/badge.svg)](https://codecov.io/gh/tidyverse/lubridate) [![CRAN RStudio mirror downloads](http://cranlogs.r-pkg.org/badges/lubridate)](https://cran.r-project.org/package=lubridate) [![Development version](https://img.shields.io/badge/devel-1.7.4.9000-orange.svg)](https://github.com/tidyverse/lubridate) [![CRAN version](http://www.r-pkg.org/badges/version/lubridate)](https://cran.r-project.org/package=lubridate)
 
 Overview
 --------