Can't convert string object to time - python

I have a dataframe containing different recorded times as string objects, such as 1:02:45, 51:11, 54:24.
I can't convert to time objects, this is the error I am getting:
"time data '49:49' does not match format '%H:%M:%S"
This is the code I am using:
df_plot2 = df[['year', 'gun_time', 'chip_time']]
df_plot2['gun_time'] = pd.to_datetime(df_plot2['gun_time'], format = '%H:%M:%S')
df_plot2['chip_time'] = pd.to_datetime(df_plot2['chip_time'], format = '%H:%M:%S')
Thanks in advance for your help!

you can create a common format in the time Series by checking string len and adding the hours as zero '00:' where there are only minutes and seconds. Then parse to datetime. Ex:
import pandas as pd
s = pd.Series(["1:02:45", "51:11", "54:24"])
m = s.str.len() <= 5
s.loc[m] = '00:' + s.loc[m]
dts = pd.to_datetime(s)
print(dts)
0 2021-12-01 01:02:45
1 2021-12-01 00:51:11
2 2021-12-01 00:54:24
dtype: datetime64[ns]

I believe it may be because for %H python expects to see 01, 02, 03 etc instead of 1, 2, 3. To use your specific example 1:02:45 may have to be in the 01:02:45 format for python to be able to convert it to a datetime variable with %H:%M:$S.

Related

Split URL at - With Python

Does anyone know how I can extract the end 6 characters in a absoloute URL e.g
/es/ideas-de-trading-y-noticias/el-ibex-35-insiste-en-buscar-los-7900-puntos-a-la-espera-de-las--221104
This is not a typical URL sometimetimes it ends -221104
Also, is there a way to turn 221104 into the date 04 11 2022 easily?
Thanks in advance
Mark
You should use the datetime module for parsing strings into datetimes, like so.
from datetime import datetime
url = 'https://www.ig.com/es/ideas-de-trading-y-noticias/el-ibex-35-insiste-en-buscar-los-7900-puntos-a-la-espera-de-las--221104'
datetime_string = url.split('--')[1]
date = datetime.strptime(datetime_string, '%y%m%d')
print(f"{date.day} {date.month} {date.year}")
the %y%m%d text tells the strptime method that the string of '221104' is formatted in the way that the first two letters are the year, the next two are the month, and the final two are the day.
Here is a link to the documentation on using this method:
https://docs.python.org/3/library/datetime.html#strftime-and-strptime-behavior
If the url always has this structure (that is it has the date at the end after a -- and only has -- once), you can get the date with:
str_date = str(url).split("--")[1]
Relaxing the assumption to have only one --, we can have the code working by just taking the last element of the splitted list (again assuming the date is always at the end):
str_date = str(url).split("--")[-1]
(Thanks to #The Myth for pointing that out)
To convert the obtained date into a datetime.date object and get it in the format you want:
from datetime import datetime
datetime_date = datetime.strptime(str_date, "%y%m%d")
formatted_date = datetime_date.strftime("%d %m %Y")
print(formatted_date) # 04 11 2022
Docs:
strftime
strptime
behaviour of the above two functions and format codes
Taking into consideration the date is constant in the format yy-mm-dd. You can split the URL by:
url = "https://www.ig.com/es/ideas-de-trading-y-noticias/el-ibex-35-insiste-en-buscar-los-7900-puntos-a-la-espera-de-las--221104"
time = url[-6:] # Gets last 6 values
To convert yy-mm-dd into dd mm yy we will use the DateTime module:
import datetime as dt
new_time = dt.datetime.strptime(time, '%y%m%d') # Converts your date into datetime using the format
format_time = dt.datetime.strftime(new_time, '%d-%m-%Y') # Format
print(format_time)
The whole code looks like this:
url = "https://www.ig.com/es/ideas-de-trading-y-noticias/el-ibex-35-insiste-en-buscar-los-7900-puntos-a-la-espera-de-las--221104"
time = url[-6:] # Gets last 6 values
import datetime as dt
new_time = dt.datetime.strptime(time, '%y%m%d') # Converts your date into datetime using the format
format_time = dt.datetime.strftime(new_time, '%d %m %Y') # Format
print(format_time)
Learn more about datetime
You can use python built-in split function.
date = url.split("--")[1]
It gives us 221104
then you can modify the string by rearranging it
date_string = f"{date[4:6]} {date[2:4]} {date[0:2]}"
this gives us 04 11 22
Assuming that -- will only be there as it is in the url you posted, you can do something as follows:
You can split the URL at -- & extract the element
a = 'https://www.ig.com/es/ideas-de-trading-y-noticias/el-ibex-35-insiste-en-buscar-los-7900-puntos-a-la-espera-de-las--221104'
desired_value = a.split('--')[1]
& to convert:
from datetime import datetime
converted_date = datetime.strptime(desired_value , "%y%m%d")
formatted_date = datetime.strftime(converted_date, "%d %m %Y")

Python Convert UTC Datetime in string to unix time

I have a column called 'created_at' in dataframe df, its value is like '2/3/15 2:00' in UTC. Now I want to convert it to unix time, how can I do that?
I tried the script like:
time.mktime(datetime.datetime.strptime(df['created_at'], "%m/%d/%Y, %H:%MM").timetuple())
It returns error I guess the tricky part is the year is '15' instead of '2015'
Is there any efficient way that I am able to deal with it?
Thanks!
since you mention that you're working with a pandas DataFrame, you can simplify to using
import pandas as pd
import numpy as np
df = pd.DataFrame({'times': ['2/3/15 2:00']})
# to datetime, format is inferred correctly
df['datetime'] = pd.to_datetime(df['times'])
# df['datetime']
# 0 2015-02-03 02:00:00
# Name: datetime, dtype: datetime64[ns]
# to Unix time / seconds since 1970-1-1 Z
# .astype(np.int64) on datetime Series gives you nanoseconds, so divide by 1e9 to get seconds
df['unix'] = df['datetime'].astype(np.int64) / 1e9
# df['unix']
# 0 1.422929e+09
# Name: unix, dtype: float64
%Y is for 4-digit years.
Since you have 2-digits years (assuming it's 20##), you can use %y specifier instead (notice the lower-case y).
You should use lowercase %y (year without century) rather than uppercase %Y (year with century)

Remove time in date format in Python

I using:
s = "20200113"
final = datetime.datetime.strptime(s, '%Y%m%d')
I need convert a number in date format (2020-01-13)
but when I print final:
2020-01-13 00:00:00
Tried datetime.date(s, '%Y%m%d') but It's returns a error:
an integer is required (got type str)
Is there any command to get only date without hour?
Once you have a datetime object just use strftime
import datetime
d = datetime.datetime.now() # Some datetime object.
print(d.strftime('%Y-%m-%d'))
which gives
2020-02-20
You can use strftime to convert back in the format you need :
import datetime
s = "20200113"
temp = datetime.datetime.strptime(s, '%Y%m%d')
# 2020-01-13 00:00:00
final = temp.strftime('%Y-%m-%d')
print(final)
# 2020-01-13
Use datetime.date(year, month, day). Slice your string and convert to integers to get the year, month and day. Now it is a datetime.date object, you can use it for other things. Here, however, we use .strftime to convert it back to text in your desired format.
s = "20200113"
year = int(s[:4]) # 2020
month = int(s[4:6]) # 1
day = int(s[6:8]) # 13
>>> datetime.date(year, month, day).strftime('%Y-%m-%d')
'2020-01-13'
You can also convert directly via strings.
>>> f'{s[:4]}-{s[4:6]}-{s[6:8]}'
'2020-01-13'
You can use .date() on datetime objects to 'remove' the time.
my_time_str = str(final.date())
will give you the wanted result

ValueError: time data '10/11/2006 24:00' does not match format '%d/%m/%Y %H:%M'

I tried:
df["datetime_obj"] = df["datetime"].apply(lambda dt: datetime.strptime(dt, "%d/%m/%Y %H:%M"))
but got this error:
ValueError: time data '10/11/2006 24:00' does not match format
'%d/%m/%Y %H:%M'
How to solve it correctly?
The reason why this does not work is because the %H parameter only accepts values in the range of 00 to 23 (both inclusive). This thus means that 24:00 is - like the error says - not a valid time string.
I think therefore we have not much other options than convert the string to a valid format. We can do this by first replacing 24:00 with 00:00, and then later increment the day for these timestamps.
Like:
from datetime import timedelta
import pandas as pd
df['datetime_zero'] = df['datetime'].str.replace('24:00', '0:00')
df['datetime_er'] = pd.to_datetime(df['datetime_zero'], format='%d/%m/%Y %H:%M')
selrow = df['datetime'].str.contains('24:00')
df['datetime_obj'] = df['datetime_er'] + selrow * timedelta(days=1)
The last line thus adds one day to the rows that contain 24:00, such that '10/11/2006 24:00' gets converted to '11/11/2006 24:00'. Note however that the above is rather unsafe since depending on the format of the timestamp this will/will not work. For the above it will (probably) work, since there is only one colon. But if for example the datetimes have seconds as well, the filter could get triggered for 00:24:00, so it might require some extra work to get it working.
Your data doesn't follow the conventions used by Python / Pandas datetime objects. There should be only one way of storing a particular datetime, i.e. '10/11/2006 24:00' should be rewritten as '11/11/2006 00:00'.
Here's one way to approach the problem:
# find datetimes which have '24:00' and rewrite
twenty_fours = df['strings'].str[-5:] == '24:00'
df.loc[twenty_fours, 'strings'] = df['strings'].str[:-5] + '00:00'
# construct datetime series
df['datetime'] = pd.to_datetime(df['strings'], format='%d/%m/%Y %H:%M')
# add one day where applicable
df.loc[twenty_fours, 'datetime'] += pd.DateOffset(1)
Here's some data to test:
dateList = ['10/11/2006 24:00', '11/11/2006 00:00', '12/11/2006 15:00']
df = pd.DataFrame({'strings': dateList})
Result after transformations described above:
print(df['datetime'])
0 2006-11-11 00:00:00
1 2006-11-11 00:00:00
2 2006-11-12 15:00:00
Name: datetime, dtype: datetime64[ns]
As indicated in the documentation (https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior), hours go from 00 to 23. 24:00 is then an error.

Python - Time delta from string and now()

I have spent some time trying to figure out how to get a time delta between time values. The only issue is that one of the times was stored in a file. So I have one string which is in essence str(datetime.datetime.now()) and datetime.datetime.now().
Specifically, I am having issues getting a delta because one of the objects is a datetime object and the other is a string.
I think the answer is that I need to get the string back in a datetime object for the delta to work.
I have looked at some of the other Stack Overflow questions relating to this including the following:
Python - Date & Time Comparison using timestamps, timedelta
Comparing a time delta in python
Convert string into datetime.time object
Converting string into datetime
Example code is as follows:
f = open('date.txt', 'r+')
line = f.readline()
date = line[:26]
now = datetime.datetime.now()
then = time.strptime(date)
delta = now - then # This does not work
Can anyone tell me where I am going wrong?
For reference, the first 26 characters are acquired from the first line of the file because this is how I am storing time e.g.
f.write(str(datetime.datetime.now())
Which would write the following:
2014-01-05 13:09:42.348000
time.strptime returns a struct_time.
datetime.datetime.now() returns a datetime object.
The two can not be subtracted directly.
Instead of time.strptime you could use datetime.datetime.strptime, which returns a datetime object. Then you could subtract now and then.
For example,
import datetime as DT
now = DT.datetime.now()
then = DT.datetime.strptime('2014-1-2', '%Y-%m-%d')
delta = now - then
print(delta)
# 3 days, 8:17:14.428035
By the way, you need to supply a date format string to time.strptime or DT.datetime.strptime.
time.strptime(date)
should have raised a ValueError.
It looks like your date string is 26 characters long. That might mean you have a date string like 'Fri, 10 Jun 2011 11:04:17 '.
If that is true, you may want to parse it like this:
then = DT.datetime.strptime('Fri, 10 Jun 2011 11:04:17 '.strip(), "%a, %d %b %Y %H:%M:%S")
print(then)
# 2011-06-10 11:04:17
There is a table describing the available directives (like %Y, %m, etc.) here.
Try this:
import time
import datetime
d = datetime.datetime.now()
now = time.mktime(d.timetuple())
And then apply the delta
if you have the year,month,day of 'then' you may use:
year = 2013
month = 1
day = 1
now_date = datetime.datetime.now()
then_date = now_date.replace(year = year, month = month, day = day)
delta = now_date - then_date

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