~:$ ssh root@192.168.122.136
root@192.168.122.136's password:

server {
        server_name superapp.plzz.de;
        location / { proxy_pass 127.0.0.1:12345; }
}

import time


now = time.gmtime(time.time())
print("curr:", now)

now = time.strftime("%Y %m %d %H %M", now)
now = list(int(i) for i in now.split())


if now[-1] < 30:
    now[-1] = 30
else:
    now[-2] += 1
    now[-1] = 0

now = time.strptime(' '.join(str(i) for i in now), "%Y %m %d %H %M")
print("next:", now)

~:$ python3 test.py
curr: time.struct_time(tm_year=2011, tm_mon=11, tm_mday=23, tm_hour=22, tm_min=36, tm_sec=27, tm_wday=2, tm_yday=327, tm_isdst=0)
next: time.struct_time(tm_year=2011, tm_mon=11, tm_mday=23, tm_hour=23, tm_min=0, tm_sec=0, tm_wday=2, tm_yday=327, tm_isdst=-1)

>>> now = datetime.datetime.now()
>>> now + datetime.timedelta(minutes=30 - (now.minute - 30 if now.minute >= 30 else 0))
datetime.datetime(2011, 11, 23, 23, 0, 26, 848912)

>>> datetime.fromtimestamp(time.time() + (1800000 - (time.time() % 1800000)))
datetime.datetime(2011, 12, 4, 13, 0)
>>> datetime.fromtimestamp(time.time() + (1800000 - (time.time() % 1800000)))
datetime.datetime(2011, 12, 4, 12, 59, 59, 999999)
>>> datetime.fromtimestamp(time.time() + (1800000 - (time.time() % 1800000)))
datetime.datetime(2011, 12, 4, 13, 0)
>>> datetime.fromtimestamp(time.time() + (1800000 - (time.time() % 1800000)))
datetime.datetime(2011, 12, 4, 12, 59, 59, 999999)

>>> "%.24f" % 0.1
'0.100000000000000005551115'