rrule.js vs dateutil.rrule

[freenetwork]

import arrow
from dateutil.rrule import rrule, rruleset, rrulestr
from dateutil.parser import *
FREQNAMES = ['YEARLY','MONTHLY','WEEKLY','DAILY','HOURLY','MINUTELY','SECONDLY']
WEEKDAYS = ['MO','TU','WE','DH','FR','SA','SU']

def rruleset_from_str(rrule_str):
    """convert string from nodejs rrule module to acceptable string for rrulestr
    and return rruleset object """
    # print (rrule_str)
    rules = rrule_str.split(';')
    # print (rules)
    clear_rules = []
    dtstart = None
    for i, rule in enumerate(rules):
        if "DTSTART" in rule or "dtstart" in rule:
            dtstart = rule
        elif "COUNT" in rule:
            if rule.split('=')[1]!='0':
                clear_rules.append(rule)
        else:
            clear_rules.append(rule)
    correct_rules = ';'.join(clear_rules)
    # print (clear_rules)
    if dtstart:
        fix_date = None
        try:
            fix_date = arrow.get(dtstart.split('=')[1].rstrip('Z'),'YYYYMMDDTHHmmss')
        except:
            fix_date = arrow.get(dtstart.split(':')[1].rstrip('Z'),'YYYYMMDDTHHmmss')
        correct_rules = 'DTSTART:{}\n'.format(fix_date.format('YYYYMMDDTHHmmssZ')) +"RRULE:"+ correct_rules
    # print (correct_rules)    
    rr_set = rrulestr(correct_rules, forceset=True)
    return rr_set
    
if __name__=='__main__':
    rr = rruleset_from_str("FREQ=WEEKLY;DTSTART=20120201T093000Z;INTERVAL=5;UNTIL=20130130T230000Z;BYDAY=MO,FR")
    print(rr)
    print(rr._rrule[0])
    print(rr._rrule[0].__dict__)

MY EVENT:
user in +07:00
event from 6.30 in TU
i save in utc, but day it same

MY RRULE: "FREQ=WEEKLY;BYDAY=TU;INTERVAL=1;DTSTART=20171106T234500Z;UNTIL=20221106T234500Z"

MY BEETWEN: from 2018-08-27 00:00:00.000+07:00 to 2018-08-20 00:00:00.000+07:00

var rrule = new RRule.fromString("FREQ=WEEKLY;BYDAY=TU;INTERVAL=1;DTSTART=20171106T234500Z;UNTIL=20221106T234500Z")
var beetween = rrule.between(moment("2018-08-27 00:00:00.000+07:00").toDate(), moment("2018-08-20 00:00:00.000+07:00").toDate())
console.log(beetween)

on rrule.js i get
[ 2018-08-20T23:45:00.000Z ]

q = "FREQ=WEEKLY;BYDAY=TU;INTERVAL=1;DTSTART=20171106T234500Z;UNTIL=20221106T234500Z"
r = rruleset_from_str(q)
t = r.between(arrow.get("2018-08-20 00:00+07:00").datetime,arrow.get("2018-08-27 00:00+07:00").datetime)
print (t)

on dateutil.rrule i get
[datetime.datetime(2018, 8, 21, 23, 45, tzinfo=tzutc())]

JS IS BAD
But it works for me. How to do the same on dateuti.rrule
How to do the same thing on Python as well as on JS

[freenetwork]

This nodejs backend

This is python backend

it is logical to translate the day into UTC. But the library does not allow this. I want to achieve the same result.

[pganssle]

I'm not sure I understand why these are different, but I think dateutil is correct here. August 21 is a Tuesday, so I'm not sure why Javascript would return a Monday. Am I missing something?

Also, you really shouldn't save local times as UTC.

[freenetwork]

import arrow
from dateutil.rrule import rrule, rruleset, rrulestr
from dateutil.parser import parse
from dateutil.tz import *
import re, arrow
FREQNAMES = ['YEARLY','MONTHLY','WEEKLY','DAILY','HOURLY','MINUTELY','SECONDLY']
WEEKDAYS = ['MO','TU','WE','DH','FR','SA','SU']

def rruleset_from_str_to_view(rrule_str, to_timezone):
    """convert string from nodejs rrule module to acceptable string for rrulestr
    and return rruleset object """
    ## print (rrule_str)
    rules = rrule_str.split(';')
    ## print (rules)
    clear_rules = []
    dtstart = None
    rr_set = None
    for i, rule in enumerate(rules):
        if "DTSTART" in rule or "dtstart" in rule:
            dtstart = rule
        elif "COUNT" in rule:
            print (rrule)
            if rule.split('=')[1]!='0':
                clear_rules.append(rule)
        else:
            clear_rules.append(rule)
    correct_rules = ';'.join(clear_rules)
    ## print (clear_rules)
    
    if dtstart:
        # print (dtstart)
        try:
            substr_date = re.search(r"(\d+)T(\d+)", dtstart)
            fix_date = arrow.get(substr_date.group(0), "YYYYMMDDTHHmmss").to(to_timezone).format("YYYYMMDDTHHmmssZ")
            # print (fix_date)
            rr_set = rrulestr(correct_rules, forceset=True, dtstart=parse(fix_date))
        except Exception as error:
            # print (error)
            rr_set = rrulestr(correct_rules, forceset=True)
    return rr_set

rr = rruleset_from_str_to_view("FREQ=WEEKLY;DTSTART=20120201T093000Z;INTERVAL=5;UNTIL=20130130T230000Z;BYDAY=MO,FR", "+07:00")

t = r.between(arrow.get("2018-08-20 00:00+07:00").datetime,arrow.get("2018-08-27 00:00+07:00").datetime)
print (t)

[ 2018-08-21T06:45:00.00+07:00 ]

I can need result