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Convert strings to dates in clojure

I have lines in the following format "2013-02-20T17:24:33Z" and "Mon Feb 25 02:42:27 +0000 2013" .

Is there a quick way to convert them to a date format so that they can be checked for equality and / or sorted.

clj-time allows me in this format (date-time 1986 10 14 4 3 27 456) . However, to achieve this I will have to parse the two lines above. The above lines are standard formats, is there a way to directly convert them to date time objects?

Thank you Murtaza

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clj-time has standard formats, see clj-time.format/show-formatters , but your second format is not a “standard” format with respect to clj time (although it looks suspiciously close to rfc822). You can create a custom formatter tho ...

 (use 'clj-time.format) (parse (formatters :date-time-no-ms) "2013-02-20T17:24:33Z") #<DateTime 2013-02-20T17:24:33.000Z> (parse (formatter "E MMM dd hh:mm:ss Z YYYY") "Mon Feb 25 02:42:27 +0000 2013" ) #<DateTime 2013-02-25T02:42:27.000Z> (show-formatters) :basic-date 20130228 :basic-date-time 20130228T114047.213Z :basic-date-time-no-ms 20130228T114047Z :basic-ordinal-date 2013059 :basic-ordinal-date-time 2013059T114047.213Z :basic-ordinal-date-time-no-ms 2013059T114047Z :basic-t-time T114047.213Z :basic-t-time-no-ms T114047Z :basic-time 114047.213Z :basic-time-no-ms 114047Z :basic-week-date 2013W094 :basic-week-date-time 2013W094T114047.213Z :basic-week-date-time-no-ms 2013W094T114047Z :date 2013-02-28 :date-hour 2013-02-28T11 :date-hour-minute 2013-02-28T11:40 :date-hour-minute-second 2013-02-28T11:40:47 :date-hour-minute-second-fraction 2013-02-28T11:40:47.213 :date-hour-minute-second-ms 2013-02-28T11:40:47.213 :date-time 2013-02-28T11:40:47.213Z :date-time-no-ms 2013-02-28T11:40:47Z :hour 11 :hour-minute 11:40 :hour-minute-second 11:40:47 :hour-minute-second-fraction 11:40:47.213 :hour-minute-second-ms 11:40:47.213 :ordinal-date 2013-059 :ordinal-date-time 2013-059T11:40:47.213Z :ordinal-date-time-no-ms 2013-059T11:40:47Z :rfc822 Thu, 28 Feb 2013 11:40:47 +0000 :t-time T11:40:47.213Z :t-time-no-ms T11:40:47Z :time 11:40:47.213Z :time-no-ms 11:40:47Z :week-date 2013-W09-4 :week-date-time 2013-W09-4T11:40:47.213Z :week-date-time-no-ms 2013-W09-4T11:40:47Z :weekyear 2013 :weekyear-week 2013-W09 :weekyear-week-day 2013-W09-4 :year 2013 :year-month 2013-02 :year-month-day 2013-02-28
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Use SimpleDateFormat .

 (let [input "Mon Feb 25 02:42:27 +0000 2013" fmt (java.text.SimpleDateFormat. "EEE MMM dd HH:mm:ss zzz yyyy")] (.parse fmt input))

Remember that to parse the names of the months and days of the week, you must correctly set the locale.

As a side note, the first date format in your question is ISO 8601 .

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