manipulating_date_strings
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manipulating_date_strings [2010/10/22 14:47] – created juckins | manipulating_date_strings [2022/05/07 12:33] (current) – juckins | ||
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Output is: Thursday, 21 October 2010 22:21:49 UTC | Output is: Thursday, 21 October 2010 22:21:49 UTC | ||
</ | </ | ||
+ | |||
+ | Querying a specific timezone to determine DST: | ||
+ | < | ||
+ | [cjuckins@lnxopc2: | ||
+ | America/ | ||
+ | |||
+ | [cjuckins@lnxopc2: | ||
+ | America/ | ||
+ | </ | ||
+ | |||
+ | Manipulating date/time from NWS text products: | ||
+ | < | ||
+ | If you take the date/time line from a current text product, such as: | ||
+ | |||
+ | 806 PM EST TUE 3 JAN 2012 | ||
+ | |||
+ | Add a colon to the hour/ | ||
+ | |||
+ | 8:06 PM EST TUE 3 JAN 2012 | ||
+ | |||
+ | You can feed that string directly into the linux date command and | ||
+ | manipulate it forward and backward by any amount of time and then print | ||
+ | it out in the same format. | ||
+ | |||
+ | Forward 6 hours: | ||
+ | $ date --date=" | ||
+ | %Y" | sed ' | ||
+ | 206 AM EST WED 4 JAN 2012 | ||
+ | |||
+ | Forward 30 minutes: | ||
+ | date --date=" | ||
+ | %b %Y" | sed ' | ||
+ | 836 PM EST TUE 3 JAN 2012 | ||
+ | |||
+ | Backward 12 hours: | ||
+ | date --date=" | ||
+ | %Y" | sed ' | ||
+ | 806 AM EST TUE 3 JAN 2012 | ||
+ | |||
+ | The 1st sed strips any leading zeros at the beginning of the line, the | ||
+ | 2nd sed strips any other leading zeros, and the final sed makes it all | ||
+ | UPPER. | ||
+ | </ | ||
+ | |||
+ | Other file stats info: | ||
+ | [[http:// | ||
+ | |||
+ | Using Linux ' | ||
+ | < | ||
+ | [juckins@lightning: | ||
+ | Sat Nov 19 23:00:00 EST 2011 | ||
+ | </ | ||
+ | |||
+ | More examples of ' | ||
+ | < | ||
+ | [juckins@lightning: | ||
+ | Sat Nov 19 18:00:00 EST 2011 | ||
+ | |||
+ | [juckins@lightning: | ||
+ | Sat Nov 19 19:01:00 EST 2011 | ||
+ | |||
+ | [juckins@lightning: | ||
+ | Sat Nov 19 16:59:00 EST 2011 | ||
+ | |||
+ | $date --date=" | ||
+ | 121002/0800 | ||
+ | |||
+ | $ date --date=" | ||
+ | 121003/1800 | ||
+ | |||
+ | $ date --date=" | ||
+ | 121002/1200 | ||
+ | |||
+ | $ date -d @1446390000 | ||
+ | Sun Nov 1 15:00:00 UTC 2015 | ||
+ | </ | ||
+ | |||
+ | Converting from seconds and a different timezone: | ||
+ | TZ=": | ||
+ | TZ=": | ||
+ | TZ=": |
manipulating_date_strings.1287773234.txt.gz · Last modified: 2010/10/22 14:47 by juckins