strftime() function returns incorrect result for month
Article ID: KB0082342
Updated On:
| Products | Versions |
|---|---|
| TIBCO Streaming | 7.x, 10.x |
Description
The strftime() function converts a timestamp field to a string, formatted according to a specified formatstring pattern, for the local time zone. The timestamp field can then be displayed and manipulated as a string instead of a timestamp.
However a defect relating to this function can cause incorrect results in some cases. For example, the correct output month from strftime() for an input timestamp of "2018-02-01 00:00:00.000-0500" should be 'Feb'. However, strftime() will incorrectly return 'Mar' instead:
For reference, %b in the above expression specifies the locale's abbreviated month name, as noted in the strftime library documentation.
However a defect relating to this function can cause incorrect results in some cases. For example, the correct output month from strftime() for an input timestamp of "2018-02-01 00:00:00.000-0500" should be 'Feb'. However, strftime() will incorrectly return 'Mar' instead:
sbd --eval "from_localtime(2018,2,1,0,0,0)"
(timestamp) 2018-02-01 00:00:00.000-0500
sbd --eval "strftime("""%b""", from_localtime(2018,2,1,0,0,0))"
(string) Mar
For reference, %b in the above expression specifies the locale's abbreviated month name, as noted in the strftime library documentation.
Issue/Introduction
The strftime() function can return incorrect result for month.
Resolution
To work around this defect, you can instead use a combination of the split() and format_time() functions. The split() function parses a string into tokens delimited by a specified character and returns a list of strings with the tokens as elements. The format_time() function (similar to strftime()) converts a timestamp field to a string using a specified pattern, as noted in the StreamBase Help under StreamBase Home > StreamBase References > StreamBase Expression Language Functions > (sub-heading) Timestamp Functions: Absolute Timestamps. For example:
This expression returns the correct month for the same input timestamp.
sbd --eval "split(split(format_time(from_localtime(2018,2,1,0,0,0), 'EEEE, MMM d, yyyy HH:mm zzzz'),',')[1],' ')[1]" (string) Feb
This expression returns the correct month for the same input timestamp.
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