timestamps.py

from datetime import datetime, timedelta
import time
from dateutil import relativedelta

def countingSessions(tms):
    size = len(tms)
    lastDay = datetime.strptime(tms[size-1], "%Y-%m-%d %H:%M:%S")
    lastDays = 1
    for i in range(size-1):
        d1 = datetime.strptime(tms[size-1-i], "%Y-%m-%d %H:%M:%S")
        d2 = datetime.strptime(tms[size-2-i], "%Y-%m-%d %H:%M:%S")
        d3 = d1 - timedelta(days=1)
        if d2.day == d3.day:
            lastDays += 1
            if lastDays==3:
                break
        elif d3.day > d2.day:
            return False
    md = lastDay.day
    sessions = 0
    d = datetime.strptime(tms[0], "%Y-%m-%d %H:%M:%S")
    if d.day + 2 >= md:
        sessions += 1
    for i in range(size-1):
        d = datetime.strptime(tms[i+1], "%Y-%m-%d %H:%M:%S")
        dprev = datetime.strptime(tms[i], "%Y-%m-%d %H:%M:%S")
        if d.day + 2 >= md:
            if d > dprev + timedelta(minutes=30):
                sessions += 1
        if sessions == 6:
            break

    if sessions == 6:
        return True
    else:
        return False