# Unix: how to get number of days from a given date like 10Dec2022 [closed]

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)

• Is it your homeworks? Can you show us the expected output? Mar 21 at 19:57
• 10Dec2022 at what time? In which timezone? How should it be rounded? Mar 21 at 20:15
• @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". Mar 22 at 7:14
• @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"? Mar 22 at 8:19
• @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 :-) Mar 29 at 10:00

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
``````
• Note that `%j` starts 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.