python datetime helper

datehelper.py

import datetime
import dateutil.parser as dtparser
from pytz import timezone, utc


KST = timezone('Asia/Seoul')

def utc_to_local(dt, tz=KST):
    try:
        return utc.localize(dt).astimezone(tz)
    except ValueError:
        return dt


def now_utc_str():
    n = datetime.datetime.utcnow()
    return utc.localize(n).isoformat()

def now_local_str(tz=KST):
    n = datetime.datetime.utcnow()
    return utc.localize(n).astimezone(tz).isoformat()

def now_utc_datetime():
    n = datetime.datetime.utcnow()
    return utc.localize(n)

def now_local_datetime(tz=KST):
    n = datetime.datetime.utcnow()
    return utc.localize(n).astimezone(tz)