Pytana

import datetime

#Useful Functions
def clamp(n, minn, maxn):
    return max(min(maxn, n), minn)
def ncomma(x):
    return "{:,}".format(x)

def getints(q,op):
    add = 0
    first = 0
    second = 0
    offset = 0
    err0 = "Mathematical Error"
    for i in q:
        if i != op:
            add += 1
        else:
            break
    #print(q[add:])
    #print(q[add:add + 2])
    if q[add:add + 2] == op + " ":
        offset = add + 2
    elif q[add:add + 1] == op:
        offset = add + 1
    else:
        print(err0)
        return 0
    first = int(q[:add])
    second = int(q[offset:])
    #Validation
    if first - (first - 1) != 1:
        return 0
    if second - (second - 1) != 1:
        return 0
    return first,second

# Actual Programs
def getdateformated():
    intime = datetime.datetime.now()
    ampm = ""
    hour = 0
    time = ""
    gmt = input ("Please write your local greenwich mean time code.")
    monthlist = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
    month = monthlist[intime.month - 1]
    dayappend = ["st","nd","rd","th"]
    dayint = intime.day
    day = str(dayint) + dayappend[clamp(dayint,1,4) - 1]
    dayname = intime.strftime("%A")
    if gmt[:1] == "+":
        #print("it's " + str(intime.hour + int(gmt[1:])) + ":" + str(intime.minute))
        hour = intime.hour + int(gmt[1:])
        #print("add")
    elif gmt[:1] == "-":
        #print("it's " + str(intime.hour - int(gmt[1:])) + ":" + str(intime.minute))
        hour = intime.hour - int(gmt[1:])
        #print("sub")
    elif gmt[:1] == "0":
        #print("it's " + str(intime.hour) + ":" + str(intime.minute))
        hour = intime.hour
    else:
        print("Error: Wrong GMT code written. Please write it again.")
        return False
    if hour > 12:
        ampm = " PM"
        hour -= 12
    elif hour < 12:
        ampm = " AM"
    time = str(hour) + ":" + str(intime.minute) + ampm
    print("it's " + dayname + " the " + day + " of " + month + ", " + str(intime.year) + ". " + time)
#Mathematic Function
def domath(q):
    first = 0
    second = 0
    result = 0
    op = ""
    if "+" in q:
        op = "+"
    elif "-" in q:
        op = "-"
    elif "*" in q:
        op = "*"
    elif "/" in q:
        op = "/"
    if getints(q,op) == 0:
        return
    elif getints(q,op) != 0:
        first,second = getints(q,op)
    if op == "+":
        result = first + second
    elif op == "-":
        result = first - second
    elif op == "*":
        result = first * second
    elif op == "/":
        result = first / second

    print(q + " is " + ncomma(result))

def core():
    q = input("Please ask me a question.")
    if "date" in q or "time" in q:
        getdateformated()
    elif "+" in q or "-" in q or "*" in q or "/" in q:
        domath(q)
core()