Re: [R] strptime, date and conversion of week number into POSIX
Hallo Patrick
I found quite usefull for working with weeks package ISOweek
https://cran.r-project.org/web/packages/ISOweek/index.html
Cheers.
Petr
> -Original Message-
> From: R-help On Behalf Of Patrick
> Giraudoux
> Sent: Monday, February 22, 2021 5:24 PM
> To: Uwe Ligges ; R mailing list project.org>; Bert Gunter
> Subject: Re: [R] strptime, date and conversion of week number into POSIX
>
> Thanks Uwe and Bert,
> I got the essential now, and can manage. Date handling stays quite a
> challenge with a variable number of weeks in a year, but I can understand
> why. Means eye-control (or NA detection) of strptime conversion stays
> necessary...
> Best,
> Patrick
>
>
> Le 22/02/2021 à 17:09, Uwe Ligges a écrit :
> > That monday does not exist. FOr the week before:
> >
> > strptime(paste0("2020-52","-1"),format="%Y-%W-%u")
> > [1] "2020-12-28"
> >
> > One week later is no longer in 2020, so there is no 53th week.
> >
> > Best,
> > Uwe Ligges
> >
> >
> >
> >
> >
> > On 22.02.2021 16:15, Patrick Giraudoux wrote:
> >> Sorry to answer to myself, but the format was clearly incorrect in
> >> the previous post. It should read, refering to the 1th day of the week:
> >>
> >> strptime(paste0(mydate,"-1"),format="%Y-%W-%u")
> >>
> >> It converts better, but with a NA on week 53
> >>
> >>> strptime(paste0(pays$year_week,"-1"),format="%Y-%W-%u")
> >>[1] "2020-01-06 CET" "2020-01-13 CET" "2020-01-20 CET"
> >> "2020-01-27 CET"
> >>[5] "2020-02-03 CET" "2020-02-10 CET" "2020-02-17 CET"
> >> "2020-02-24 CET"
> >>[9] "2020-03-02 CET" "2020-03-09 CET" "2020-03-16 CET"
> >> "2020-03-23 CET"
> >> [13] "2020-03-30 CEST" "2020-04-06 CEST" "2020-04-13 CEST"
> >> "2020-04-20 CEST"
> >> [17] "2020-04-27 CEST" "2020-05-04 CEST" "2020-05-11 CEST"
> >> "2020-05-18 CEST"
> >> [21] "2020-05-25 CEST" "2020-06-01 CEST" "2020-06-08 CEST"
> >> "2020-06-15 CEST"
> >> [25] "2020-06-22 CEST" "2020-06-29 CEST" "2020-07-06 CEST"
> >> "2020-07-13 CEST"
> >> [29] "2020-07-20 CEST" "2020-07-27 CEST" "2020-08-03 CEST"
> >> "2020-08-10 CEST"
> >> [33] "2020-08-17 CEST" "2020-08-24 CEST" "2020-08-31 CEST"
> >> "2020-09-07 CEST"
> >> [37] "2020-09-14 CEST" "2020-09-21 CEST" "2020-09-28 CEST"
> >> "2020-10-05 CEST"
> >> [41] "2020-10-12 CEST" "2020-10-19 CEST" "2020-10-26 CET" "2020-11-02
> >> CET"
> >> [45] "2020-11-09 CET" "2020-11-16 CET" "2020-11-23 CET" "2020-11-30
> >> CET"
> >> [49] "2020-12-07 CET" "2020-12-14 CET" "2020-12-21 CET" "2020-12-28
> >> CET"
> >> [53] NA"2021-01-04 CET" "2021-01-11 CET" "2021-01-18
> >> CET"
> >> [57] "2021-01-25 CET" "2021-02-01 CET" "2021-02-08 CET"
> >> Warning message:
> >> In strptime(paste0(pays$year_week, "-1"), format = "%Y-%W-%u") :
> >> (0-based) yday 369 in year 2020 is invalid
> >>
> >>
> >> Any idea on how to handle this ?
> >>
> >>
> >>
> >>
> >> Le 22/02/2021 à 15:26, Patrick Giraudoux a écrit :
> >>>
> >>> Dear all,
> >>>
> >>> I have a trouble trying to convert dates given in character to POSIX.
> >>> The date is expressed as a year then the week number e.g. "2020-01"
> >>> (first week of 2020). I thought is can be converted as following:
> >>>
> >>> strptime(mydate,format="%Y-%W")
> >>>
> >>> %W refering to the week of the year as decimal number (00–53) using
> >>> Monday as the first day of week (and typically with the first Monday
> >>> of the year as day 1 of week 1), as indicated in the doc.
> >>>
> >>> However, I got this result, with the month fixed to 02 (february)
> >>> and day 22 (only the year is converted correctly):
> >>>
> >>> strptime(mydate,format="%Y-%W") [1] "2020-02-22 CET" "2020-02-22
> CET"
> >>> "2020-02-22 CET" "2020-02-22 CET" [5] "2020-02-22 CET" "2020-02-22
> >>> CET" "2020-02-22 CET" "2020-02-22 CET" [9] "2020-02-22 CET"
> >>> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [13] "2020-02-22
> >>> CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [17]
> >>> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
> >>> [21] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22
> >>> CET" [25] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
> >>> "2020-02-22 CET" [29] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22
> >>> CET" "2020-02-22 CET" [33] "2020-02-22 CET" "2020-02-22 CET"
> >>> "2020-02-22 CET" "2020-02-22 CET" [37] "2020-02-22 CET" "2020-02-22
> >>> CET" "2020-02-22 CET" "2020-02-22 CET" [41] "2020-02-22 CET"
> >>> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [45] "2020-02-22
> >>> CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [49]
> >>> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
> >>> [53] "2020-02-22 CET" "2021-02-22 CET" "2021-02-22 CET" "2021-02-22
> >>> CET" [57] "2021-02-22 CET" "2021-02-22 CET" "2021-02-22 CET"
> >>>
> >>> You'll find below a dump of "mydate" you can copy and paster if you
> >>> need a try
> >>>
> >>> Any hint welcome...
> >>>
> >>> Best,
> >>>
> >>> Patrick
> >>>
> >>> mydate <-
> >>> c("2020-01", "2020-02",
Re: [R] strptime, date and conversion of week number into POSIX
That monday does not exist. FOr the week before:
strptime(paste0("2020-52","-1"),format="%Y-%W-%u")
[1] "2020-12-28"
One week later is no longer in 2020, so there is no 53th week.
Best,
Uwe Ligges
On 22.02.2021 16:15, Patrick Giraudoux wrote:
Sorry to answer to myself, but the format was clearly incorrect in the
previous post. It should read, refering to the 1th day of the week:
strptime(paste0(mydate,"-1"),format="%Y-%W-%u")
It converts better, but with a NA on week 53
strptime(paste0(pays$year_week,"-1"),format="%Y-%W-%u")
[1] "2020-01-06 CET" "2020-01-13 CET" "2020-01-20 CET" "2020-01-27 CET"
[5] "2020-02-03 CET" "2020-02-10 CET" "2020-02-17 CET" "2020-02-24 CET"
[9] "2020-03-02 CET" "2020-03-09 CET" "2020-03-16 CET" "2020-03-23 CET"
[13] "2020-03-30 CEST" "2020-04-06 CEST" "2020-04-13 CEST" "2020-04-20 CEST"
[17] "2020-04-27 CEST" "2020-05-04 CEST" "2020-05-11 CEST" "2020-05-18 CEST"
[21] "2020-05-25 CEST" "2020-06-01 CEST" "2020-06-08 CEST" "2020-06-15 CEST"
[25] "2020-06-22 CEST" "2020-06-29 CEST" "2020-07-06 CEST" "2020-07-13 CEST"
[29] "2020-07-20 CEST" "2020-07-27 CEST" "2020-08-03 CEST" "2020-08-10 CEST"
[33] "2020-08-17 CEST" "2020-08-24 CEST" "2020-08-31 CEST" "2020-09-07 CEST"
[37] "2020-09-14 CEST" "2020-09-21 CEST" "2020-09-28 CEST" "2020-10-05 CEST"
[41] "2020-10-12 CEST" "2020-10-19 CEST" "2020-10-26 CET" "2020-11-02 CET"
[45] "2020-11-09 CET" "2020-11-16 CET" "2020-11-23 CET" "2020-11-30 CET"
[49] "2020-12-07 CET" "2020-12-14 CET" "2020-12-21 CET" "2020-12-28 CET"
[53] NA"2021-01-04 CET" "2021-01-11 CET" "2021-01-18 CET"
[57] "2021-01-25 CET" "2021-02-01 CET" "2021-02-08 CET"
Warning message:
In strptime(paste0(pays$year_week, "-1"), format = "%Y-%W-%u") :
(0-based) yday 369 in year 2020 is invalid
Any idea on how to handle this ?
Le 22/02/2021 à 15:26, Patrick Giraudoux a écrit :
Dear all,
I have a trouble trying to convert dates given in character to POSIX.
The date is expressed as a year then the week number e.g. "2020-01"
(first week of 2020). I thought is can be converted as following:
strptime(mydate,format="%Y-%W")
%W refering to the week of the year as decimal number (00–53) using
Monday as the first day of week (and typically with the first Monday
of the year as day 1 of week 1), as indicated in the doc.
However, I got this result, with the month fixed to 02 (february) and
day 22 (only the year is converted correctly):
strptime(mydate,format="%Y-%W") [1] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [5] "2020-02-22 CET" "2020-02-22
CET" "2020-02-22 CET" "2020-02-22 CET" [9] "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [13] "2020-02-22
CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [17]
"2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
[21] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22
CET" [25] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" [29] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22
CET" "2020-02-22 CET" [33] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [37] "2020-02-22 CET" "2020-02-22
CET" "2020-02-22 CET" "2020-02-22 CET" [41] "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [45] "2020-02-22
CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [49]
"2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
[53] "2020-02-22 CET" "2021-02-22 CET" "2021-02-22 CET" "2021-02-22
CET" [57] "2021-02-22 CET" "2021-02-22 CET" "2021-02-22 CET"
You'll find below a dump of "mydate" you can copy and paster if you
need a try
Any hint welcome...
Best,
Patrick
mydate <-
c("2020-01", "2020-02", "2020-03", "2020-04", "2020-05", "2020-06",
"2020-07", "2020-08", "2020-09", "2020-10", "2020-11", "2020-12",
"2020-13", "2020-14", "2020-15", "2020-16", "2020-17", "2020-18",
"2020-19", "2020-20", "2020-21", "2020-22", "2020-23", "2020-24",
"2020-25", "2020-26", "2020-27", "2020-28", "2020-29", "2020-30",
"2020-31", "2020-32", "2020-33", "2020-34", "2020-35", "2020-36",
"2020-37", "2020-38", "2020-39", "2020-40", "2020-41", "2020-42",
"2020-43", "2020-44", "2020-45", "2020-46", "2020-47", "2020-48",
"2020-49", "2020-50", "2020-51", "2020-52", "2020-53", "2021-01",
"2021-02", "2021-03", "2021-04", "2021-05", "2021-06")
[[alternative HTML version deleted]]
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained,
Re: [R] strptime, date and conversion of week number into POSIX
Thanks Uwe and Bert,
I got the essential now, and can manage. Date handling stays quite a
challenge with a variable number of weeks in a year, but I can
understand why. Means eye-control (or NA detection) of strptime
conversion stays necessary...
Best,
Patrick
Le 22/02/2021 à 17:09, Uwe Ligges a écrit :
> That monday does not exist. FOr the week before:
>
> strptime(paste0("2020-52","-1"),format="%Y-%W-%u")
> [1] "2020-12-28"
>
> One week later is no longer in 2020, so there is no 53th week.
>
> Best,
> Uwe Ligges
>
>
>
>
>
> On 22.02.2021 16:15, Patrick Giraudoux wrote:
>> Sorry to answer to myself, but the format was clearly incorrect in the
>> previous post. It should read, refering to the 1th day of the week:
>>
>> strptime(paste0(mydate,"-1"),format="%Y-%W-%u")
>>
>> It converts better, but with a NA on week 53
>>
>>> strptime(paste0(pays$year_week,"-1"),format="%Y-%W-%u")
>> [1] "2020-01-06 CET" "2020-01-13 CET" "2020-01-20 CET"
>> "2020-01-27 CET"
>> [5] "2020-02-03 CET" "2020-02-10 CET" "2020-02-17 CET"
>> "2020-02-24 CET"
>> [9] "2020-03-02 CET" "2020-03-09 CET" "2020-03-16 CET"
>> "2020-03-23 CET"
>> [13] "2020-03-30 CEST" "2020-04-06 CEST" "2020-04-13 CEST"
>> "2020-04-20 CEST"
>> [17] "2020-04-27 CEST" "2020-05-04 CEST" "2020-05-11 CEST"
>> "2020-05-18 CEST"
>> [21] "2020-05-25 CEST" "2020-06-01 CEST" "2020-06-08 CEST"
>> "2020-06-15 CEST"
>> [25] "2020-06-22 CEST" "2020-06-29 CEST" "2020-07-06 CEST"
>> "2020-07-13 CEST"
>> [29] "2020-07-20 CEST" "2020-07-27 CEST" "2020-08-03 CEST"
>> "2020-08-10 CEST"
>> [33] "2020-08-17 CEST" "2020-08-24 CEST" "2020-08-31 CEST"
>> "2020-09-07 CEST"
>> [37] "2020-09-14 CEST" "2020-09-21 CEST" "2020-09-28 CEST"
>> "2020-10-05 CEST"
>> [41] "2020-10-12 CEST" "2020-10-19 CEST" "2020-10-26 CET" "2020-11-02
>> CET"
>> [45] "2020-11-09 CET" "2020-11-16 CET" "2020-11-23 CET" "2020-11-30
>> CET"
>> [49] "2020-12-07 CET" "2020-12-14 CET" "2020-12-21 CET" "2020-12-28
>> CET"
>> [53] NA "2021-01-04 CET" "2021-01-11 CET" "2021-01-18
>> CET"
>> [57] "2021-01-25 CET" "2021-02-01 CET" "2021-02-08 CET"
>> Warning message:
>> In strptime(paste0(pays$year_week, "-1"), format = "%Y-%W-%u") :
>> (0-based) yday 369 in year 2020 is invalid
>>
>>
>> Any idea on how to handle this ?
>>
>>
>>
>>
>> Le 22/02/2021 à 15:26, Patrick Giraudoux a écrit :
>>>
>>> Dear all,
>>>
>>> I have a trouble trying to convert dates given in character to POSIX.
>>> The date is expressed as a year then the week number e.g. "2020-01"
>>> (first week of 2020). I thought is can be converted as following:
>>>
>>> strptime(mydate,format="%Y-%W")
>>>
>>> %W refering to the week of the year as decimal number (00–53) using
>>> Monday as the first day of week (and typically with the first Monday
>>> of the year as day 1 of week 1), as indicated in the doc.
>>>
>>> However, I got this result, with the month fixed to 02 (february) and
>>> day 22 (only the year is converted correctly):
>>>
>>> strptime(mydate,format="%Y-%W") [1] "2020-02-22 CET" "2020-02-22 CET"
>>> "2020-02-22 CET" "2020-02-22 CET" [5] "2020-02-22 CET" "2020-02-22
>>> CET" "2020-02-22 CET" "2020-02-22 CET" [9] "2020-02-22 CET"
>>> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [13] "2020-02-22
>>> CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [17]
>>> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
>>> [21] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22
>>> CET" [25] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
>>> "2020-02-22 CET" [29] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22
>>> CET" "2020-02-22 CET" [33] "2020-02-22 CET" "2020-02-22 CET"
>>> "2020-02-22 CET" "2020-02-22 CET" [37] "2020-02-22 CET" "2020-02-22
>>> CET" "2020-02-22 CET" "2020-02-22 CET" [41] "2020-02-22 CET"
>>> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [45] "2020-02-22
>>> CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [49]
>>> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
>>> [53] "2020-02-22 CET" "2021-02-22 CET" "2021-02-22 CET" "2021-02-22
>>> CET" [57] "2021-02-22 CET" "2021-02-22 CET" "2021-02-22 CET"
>>>
>>> You'll find below a dump of "mydate" you can copy and paster if you
>>> need a try
>>>
>>> Any hint welcome...
>>>
>>> Best,
>>>
>>> Patrick
>>>
>>> mydate <-
>>> c("2020-01", "2020-02", "2020-03", "2020-04", "2020-05", "2020-06",
>>> "2020-07", "2020-08", "2020-09", "2020-10", "2020-11", "2020-12",
>>> "2020-13", "2020-14", "2020-15", "2020-16", "2020-17", "2020-18",
>>> "2020-19", "2020-20", "2020-21", "2020-22", "2020-23", "2020-24",
>>> "2020-25", "2020-26", "2020-27", "2020-28", "2020-29", "2020-30",
>>> "2020-31", "2020-32", "2020-33", "2020-34", "2020-35", "2020-36",
>>> "2020-37", "2020-38", "2020-39", "2020-40", "2020-41", "2020-42",
>>> "2020-43", "2020-44", "2020-45", "2020-46", "2020-47", "2020-48",
>>> "2020-49", "2020-50", "2020-51", "2020-52", "2020-53", "2021-01",
>>> "2021-02", "2021-03",
Re: [R] strptime, date and conversion of week number into POSIX
I think the relevant info from ?strptime is:
"For strptime the input string need not specify the date completely: it is
assumed that unspecified seconds, minutes or hours are zero, and an
unspecified year, month or day is the current one. (However, if a month is
specified, the day of that month has to be specified by %d or %e since the
current day of the month need not be valid for the specified month.) Some
components may be returned as NA (but an unknown tzone component is
represented by an empty string)."
I think this means that your strings cannot be converted by strptime() as
essential info is missing. Input from those with more date-time expertise
on this point would be welcome, however.
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Mon, Feb 22, 2021 at 6:27 AM Patrick Giraudoux <
patrick.giraud...@univ-fcomte.fr> wrote:
> Dear all,
>
> I have a trouble trying to convert dates given in character to POSIX.
> The date is expressed as a year then the week number e.g. "2020-01"
> (first week of 2020). I thought is can be converted as following:
>
> strptime(mydate,format="%Y-%W")
>
> %W refering to the week of the year as decimal number (00–53) using
> Monday as the first day of week (and typically with the first Monday of
> the year as day 1 of week 1), as indicated in the doc.
>
> However, I got this result, with the month fixed to 02 (february) and
> day 22 (only the year is converted correctly):
>
> strptime(mydate,format="%Y-%W") [1] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [5] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [9] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [13] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [17] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [21] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [25] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [29] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [33] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [37] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [41] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [45] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [49] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [53] "2020-02-22 CET" "2021-02-22 CET"
> "2021-02-22 CET" "2021-02-22 CET" [57] "2021-02-22 CET" "2021-02-22 CET"
> "2021-02-22 CET"
>
> You'll find below a dump of "mydate" you can copy and paster if you need
> a try
>
> Any hint welcome...
>
> Best,
>
> Patrick
>
> mydate <-
> c("2020-01", "2020-02", "2020-03", "2020-04", "2020-05", "2020-06",
> "2020-07", "2020-08", "2020-09", "2020-10", "2020-11", "2020-12",
> "2020-13", "2020-14", "2020-15", "2020-16", "2020-17", "2020-18",
> "2020-19", "2020-20", "2020-21", "2020-22", "2020-23", "2020-24",
> "2020-25", "2020-26", "2020-27", "2020-28", "2020-29", "2020-30",
> "2020-31", "2020-32", "2020-33", "2020-34", "2020-35", "2020-36",
> "2020-37", "2020-38", "2020-39", "2020-40", "2020-41", "2020-42",
> "2020-43", "2020-44", "2020-45", "2020-46", "2020-47", "2020-48",
> "2020-49", "2020-50", "2020-51", "2020-52", "2020-53", "2021-01",
> "2021-02", "2021-03", "2021-04", "2021-05", "2021-06")
>
>
> [[alternative HTML version deleted]]
>
> __
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Re: [R] strptime, date and conversion of week number into POSIX
Sorry to answer to myself, but the format was clearly incorrect in the
previous post. It should read, refering to the 1th day of the week:
strptime(paste0(mydate,"-1"),format="%Y-%W-%u")
It converts better, but with a NA on week 53
> strptime(paste0(pays$year_week,"-1"),format="%Y-%W-%u")
[1] "2020-01-06 CET" "2020-01-13 CET" "2020-01-20 CET" "2020-01-27 CET"
[5] "2020-02-03 CET" "2020-02-10 CET" "2020-02-17 CET" "2020-02-24 CET"
[9] "2020-03-02 CET" "2020-03-09 CET" "2020-03-16 CET" "2020-03-23 CET"
[13] "2020-03-30 CEST" "2020-04-06 CEST" "2020-04-13 CEST" "2020-04-20 CEST"
[17] "2020-04-27 CEST" "2020-05-04 CEST" "2020-05-11 CEST" "2020-05-18 CEST"
[21] "2020-05-25 CEST" "2020-06-01 CEST" "2020-06-08 CEST" "2020-06-15 CEST"
[25] "2020-06-22 CEST" "2020-06-29 CEST" "2020-07-06 CEST" "2020-07-13 CEST"
[29] "2020-07-20 CEST" "2020-07-27 CEST" "2020-08-03 CEST" "2020-08-10 CEST"
[33] "2020-08-17 CEST" "2020-08-24 CEST" "2020-08-31 CEST" "2020-09-07 CEST"
[37] "2020-09-14 CEST" "2020-09-21 CEST" "2020-09-28 CEST" "2020-10-05 CEST"
[41] "2020-10-12 CEST" "2020-10-19 CEST" "2020-10-26 CET" "2020-11-02 CET"
[45] "2020-11-09 CET" "2020-11-16 CET" "2020-11-23 CET" "2020-11-30 CET"
[49] "2020-12-07 CET" "2020-12-14 CET" "2020-12-21 CET" "2020-12-28 CET"
[53] NA"2021-01-04 CET" "2021-01-11 CET" "2021-01-18 CET"
[57] "2021-01-25 CET" "2021-02-01 CET" "2021-02-08 CET"
Warning message:
In strptime(paste0(pays$year_week, "-1"), format = "%Y-%W-%u") :
(0-based) yday 369 in year 2020 is invalid
Any idea on how to handle this ?
Le 22/02/2021 à 15:26, Patrick Giraudoux a écrit :
>
> Dear all,
>
> I have a trouble trying to convert dates given in character to POSIX.
> The date is expressed as a year then the week number e.g. "2020-01"
> (first week of 2020). I thought is can be converted as following:
>
> strptime(mydate,format="%Y-%W")
>
> %W refering to the week of the year as decimal number (00–53) using
> Monday as the first day of week (and typically with the first Monday
> of the year as day 1 of week 1), as indicated in the doc.
>
> However, I got this result, with the month fixed to 02 (february) and
> day 22 (only the year is converted correctly):
>
> strptime(mydate,format="%Y-%W") [1] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [5] "2020-02-22 CET" "2020-02-22
> CET" "2020-02-22 CET" "2020-02-22 CET" [9] "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [13] "2020-02-22
> CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [17]
> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
> [21] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22
> CET" [25] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" [29] "2020-02-22 CET" "2020-02-22 CET" "2020-02-22
> CET" "2020-02-22 CET" [33] "2020-02-22 CET" "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" [37] "2020-02-22 CET" "2020-02-22
> CET" "2020-02-22 CET" "2020-02-22 CET" [41] "2020-02-22 CET"
> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [45] "2020-02-22
> CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" [49]
> "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET" "2020-02-22 CET"
> [53] "2020-02-22 CET" "2021-02-22 CET" "2021-02-22 CET" "2021-02-22
> CET" [57] "2021-02-22 CET" "2021-02-22 CET" "2021-02-22 CET"
>
> You'll find below a dump of "mydate" you can copy and paster if you
> need a try
>
> Any hint welcome...
>
> Best,
>
> Patrick
>
> mydate <-
> c("2020-01", "2020-02", "2020-03", "2020-04", "2020-05", "2020-06",
> "2020-07", "2020-08", "2020-09", "2020-10", "2020-11", "2020-12",
> "2020-13", "2020-14", "2020-15", "2020-16", "2020-17", "2020-18",
> "2020-19", "2020-20", "2020-21", "2020-22", "2020-23", "2020-24",
> "2020-25", "2020-26", "2020-27", "2020-28", "2020-29", "2020-30",
> "2020-31", "2020-32", "2020-33", "2020-34", "2020-35", "2020-36",
> "2020-37", "2020-38", "2020-39", "2020-40", "2020-41", "2020-42",
> "2020-43", "2020-44", "2020-45", "2020-46", "2020-47", "2020-48",
> "2020-49", "2020-50", "2020-51", "2020-52", "2020-53", "2021-01",
> "2021-02", "2021-03", "2021-04", "2021-05", "2021-06")
>
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[R] strptime, date and conversion of week number into POSIX
Dear all,
I have a trouble trying to convert dates given in character to POSIX.
The date is expressed as a year then the week number e.g. "2020-01"
(first week of 2020). I thought is can be converted as following:
strptime(mydate,format="%Y-%W")
%W refering to the week of the year as decimal number (00–53) using
Monday as the first day of week (and typically with the first Monday of
the year as day 1 of week 1), as indicated in the doc.
However, I got this result, with the month fixed to 02 (february) and
day 22 (only the year is converted correctly):
strptime(mydate,format="%Y-%W") [1] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [5] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [9] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [13] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [17] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [21] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [25] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [29] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [33] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [37] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [41] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [45] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [49] "2020-02-22 CET" "2020-02-22 CET"
"2020-02-22 CET" "2020-02-22 CET" [53] "2020-02-22 CET" "2021-02-22 CET"
"2021-02-22 CET" "2021-02-22 CET" [57] "2021-02-22 CET" "2021-02-22 CET"
"2021-02-22 CET"
You'll find below a dump of "mydate" you can copy and paster if you need
a try
Any hint welcome...
Best,
Patrick
mydate <-
c("2020-01", "2020-02", "2020-03", "2020-04", "2020-05", "2020-06",
"2020-07", "2020-08", "2020-09", "2020-10", "2020-11", "2020-12",
"2020-13", "2020-14", "2020-15", "2020-16", "2020-17", "2020-18",
"2020-19", "2020-20", "2020-21", "2020-22", "2020-23", "2020-24",
"2020-25", "2020-26", "2020-27", "2020-28", "2020-29", "2020-30",
"2020-31", "2020-32", "2020-33", "2020-34", "2020-35", "2020-36",
"2020-37", "2020-38", "2020-39", "2020-40", "2020-41", "2020-42",
"2020-43", "2020-44", "2020-45", "2020-46", "2020-47", "2020-48",
"2020-49", "2020-50", "2020-51", "2020-52", "2020-53", "2021-01",
"2021-02", "2021-03", "2021-04", "2021-05", "2021-06")
[[alternative HTML version deleted]]
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