Team,
Can someone help find code for below.. Unix: how to get a count of number of days from a given date like 10Dec2022 to today.
Looking for Answer: 102 as of (22Mar2023)
8
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1Is it your homeworks? Can you show us the expected output?– Gilles QuénotMar 21 at 19:57
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110Dec2022 at what time? In which timezone? How should it be rounded?– Stéphane ChazelasMar 21 at 20:15
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@StéphaneChazelas How is timezone relevant? Has a different number of days passed since 10 Dec 2022 in Tokyo and Washington? Also when asked "how many days till christmas" very few people would answer "281.15423342".– Peregrino69Mar 22 at 7:14
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2@StéphaneChazelas ... Yeah, there is, it's now 21:18 March 21 in Midway, while Kiritimati is 10:18 March 22. But how often is this question interpreted as "How many days have passed in Kiritimati since it was December 22 2022 in Midway"?– Peregrino69Mar 22 at 8:19
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1@AdminBee Right, didn't think of the possibility that the OP's been sitting for months in a plane continuously circulating the Earth eastwards :-D Sometimes questions just are as simple as they seem :-)– Peregrino69Mar 29 at 10:00
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2 Answers
If you need to fetch the number of days since the start of the year for given date:
With GNU date:
$ date -d '10Dec2022' +%j
With perl:
$ perl -MTime::Piece -sE '
say Time::Piece->strptime($date, "%d%b%Y")->strftime("%j")
' -- -date="10Dec2022"
Output
344
answered Mar 21 at 20:51
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1Note that
%jstarts at 1 on January 1st 00:00:00, so strictly speaking, it's more like one plus the number of days since the start of the year. Mar 22 at 7:48
If it's about getting the number of days since that date, with ddiff from dateutils (sometimes called dateutils.ddiff):
$ date +%F
2023-03-22
$ dateutils.ddiff -i %d%b%Y 10Dec2022 now
102
That's independent of the current time of the day. 0 would be reported from 00:00 to 23:59 local time on 2022-12-10 and increments at midnight.
answered Mar 22 at 9:21
