Second Date
Second Date provides a handful of utility functions for working with java.time. The most important are:
parse
Can parse almost any temporal literal String to the correct java.time class.
(require '[second-date.core :as second-date])
(second-date/parse "2020-04")
;; -> #object[java.time.LocalDate 0x1998e54f "2020-04-01"]
(second-date/parse "2020-04-01")
;; -> #object[java.time.LocalDate 0x1998e54f "2020-04-01"]
(second-date/parse "2020-04-01T15:01")
;; -> #object[java.time.LocalDateTime 0x121829b7 "2020-04-01T15:01"]
(second-date/parse "2020-04-01T15:01-07:00")
;; -> #object[java.time.OffsetDateTime 0x7dc126b0 "2020-04-01T15:01-07:00"]
(second-date/parse "2020-04-01T15:01-07:00[US/Pacific]")
;; -> #object[java.time.ZonedDateTime 0x351fb7c8 "2020-04-01T15:01-07:00[US/Pacific]"]parse handles ISO-8601 strings as well as SQL literals (e.g. 2020-04-01 15:01:00).
format
Formats any of the main java.time temporal instant classes as a String. Uses ISO-8601 by default, but can use any
java.time.format.DateTimeFormatter or keywords naming static formatters as understood by
clojure.java-time.
(require '[java-time :as t]
'[second-date.core :as second-date])
(second-date/format (t/zoned-date-time "2020-04-01T15:01-07:00[US/Pacific]"))
;; -> "2020-04-01T16:01:00-07:00"
(second-date/format (t/offset-date-time "2020-04-01T15:01-07:00"))
;; -> "2020-04-01T16:01:00-07:00"
(second-date/format (t/local-date-time "2020-04-01T15:01"))
;; -> "2020-04-01T15:01:00"
;; with a different formatter
(second-date/format :basic-iso-date (t/local-date-time "2020-04-01T15:01"))
;; -> "20200401"
;; it even handles Instants
(second-date/format :iso-week-date (t/instant "2020-04-01T15:01:00-07:00"))
;; "2020-W14-3Z"Check the value of java-time.format/predefined-formatters for all supported predefined formatters.
second-date.parse.builder/formatter
second-date.parse.builder/formatter is a Clojure interface for java.time.format.DateTimeFormatterBuilder, used to
create DateTimeFormatters.
(require '[java-time :as t]
'[second-date :as second-date]
'[second-date.parse.builder :as b])
(def my-time-formatter
(b/formatter
(b/case-insensitive
(b/value :hour-of-day 2)
(b/optional
":"
(b/value :minute-of-hour 2)
(b/optional
":"
(b/value :second-of-minute))))))
;; -> #object[java.time.format.DateTimeFormatter "ParseCaseSensitive(false)Value(HourOfDay,2)[':'Value(MinuteOfHour,2)[':'Value(SecondOfMinute)]]"]
;; you can now use the formatter to format and parse
(second-date/format my-time-formatter (t/zoned-date-time "2020-04-01T15:23:52.878132-07:00[America/Los_Angeles]"))
;; -> "15:23:52"
(second-date/parse my-time-formatter "15:23:52")
;; -> #object[java.time.LocalTime 0x514c293c "15:23:52"]Some example formatters can be found in second-date.parse.