import datetime,time
def stamp(hour, min):
    return int(datetime.datetime(2018, 7, 17, hour,min).timestamp())
def ListSlotsAvailable(start, ent, durn):
    secdurn=durn*60
    for sec in range(start, ent, secdurn):
        enttime = sec+secdurn
        print("Stamp is %d-%d" % (sec, enttime))
        print(hour_from_stamp(sec))
        print(min_from_stamp(sec))
        print(hour_from_stamp(enttime))
        print(min_from_stamp(enttime))
def hour_from_stamp(stamp):
    import datetime
    print(datetime.datetime.fromtimestamp(stamp).strftime('%H'))

def min_from_stamp(stamp):
    import datetime
    print(datetime.datetime.fromtimestamp(stamp).strftime('%M'))

starthr=input("Give start time in hour")
startmin=input("Give start time in min")
start=stamp(int(starthr), int(startmin))
endhr=input("Give end time in hour")
endmin=input("Give end time in min")
ent=stamp(int(endhr), int(endmin))
durn=int(input("Give duration for each consultation"))
ListSlotsAvailable(start, ent, durn)

Give start time in hour10
Give start time in min15
Give end time in hour12
Give end time in min30
Give duration for each consultation30
Stamp is 1531802700-1531804500
10
None
15
None
10
None
45
None
Stamp is 1531804500-1531806300
10
None
45
None
11
None
15
None
Stamp is 1531806300-1531808100
11
None
15
None
11
None
45
None
Stamp is 1531808100-1531809900
11
None
45
None
12
None
15
None
Stamp is 1531809900-1531811700
12
None
15
None
12
None
45
None

1