Date Format utils function Included the regular expression and the datetime utils function.

dateformatter.py

import re
from datetime import datetime, timedelta


datas=["01:48PM","Yesterday 06:31PM", "04/08 05:25PM","11/07/2018 05:12PM"]


def date_parse(data):
    pattern1 = "(\d{2}):(\d{2})([AaPp][Mm])"
    pattern2 = "Yesterday "+pattern1
    pattern3 = "(\d{2})/(\d{2}) "+pattern1
    pattern4 = "(\d{2})/(\d{2})/(\d{4}) " +pattern1
    actual_date=datetime.today()

    # pattern_test=pattern1
    # print re.match(pattern_test,datas[0])
    # print re.match(pattern_test,datas[1])
    # print re.match(pattern_test,datas[2])
    # print re.match(pattern_test,datas[3])

    if re.match(pattern1,data):
        m=re.match(pattern1,data)
        hh,mm,mode=int(m.group(1)),int(m.group(2)),m.group(3)
        if mode == "PM":   hh+=12
        if hh >=24 : hh=hh-24
        actual_date = actual_date.replace(hour=hh, minute=mm)

    elif re.match(pattern2,data):
        m=re.match(pattern2,data)
        hh,mm,mode=int(m.group(1)),int(m.group(2)),m.group(3)
        if mode == "PM":   hh+=12
        if hh >=24 : hh=hh-24
        actual_date = actual_date.replace(hour=hh, minute=mm) - timedelta(days=1)

    elif re.match(pattern3,data):
        m=re.match(pattern3,data)
        DD,MM,hh,mm,mode=int(m.group(1)),int(m.group(2)),int(m.group(3)),int(m.group(4)),m.group(5)
        if mode == "PM":   hh+=12
        if hh >=24 : hh=hh-24
        actual_date = actual_date.replace(day=DD , month=MM, hour=hh, minute=mm)

    elif re.match(pattern4,data):
        m=re.match(pattern4,data)
        DD,MM,YYYY,hh,mm,mode=int(m.group(1)),int(m.group(2)),int(m.group(3)),int(m.group(4)),int(m.group(5)),m.group(6)
        if mode == "PM":   hh+=12
        if hh >=24 : hh=hh-24
        actual_date = actual_date.replace(day=DD , month=MM,year=YYYY,hour=hh, minute=mm)

    actual_date=actual_date.replace(second=00,microsecond=00)
    return actual_date

# for data in datas:
#     print date_parse(data)

current_date=datetime.today()
date_format=current_date.strftime("%a %m/%d/%Y")
print date_format