if not is_valid(text):

reply_text = "Incorrect Format - Should be HH:MM (eg. 09:00 or 16:45)"

return create_json(reply_text, user_id)

hours = text[0:2]

minutes = text[3:5]

# Handle timezone

now = Delorean()

now.shift("Europe/London") # Currently only supports UK timezone

# If today is Monday and before our target time

if now.datetime.weekday() == 0 and (now.datetime.hour < int(hours) or (now.datetime.hour == int(hours) and now.datetime.minute < int(minutes))):

monday = now.datetime

else:

monday = now.next_monday().datetime

target = Delorean(datetime.datetime(monday.year, monday.month, monday.day, int(hours), int(minutes)), timezone='Europe/London')

# Calculate time

result = (target - now)

days_until = result.days

hours_until = result.seconds / 60 / 60

minutes_until = (result.seconds / 60) - (hours_until * 60)

# Format message

days_format = "day" if days_until == 1 else "days"

hours_format = "hour" if hours_until == 1 else "hours"

minutes_format = "minute" if minutes_until == 1 else "minutes"

reply_text = "{} {}, {} {} and {} {} until Monday at {}:{}.".format(days_until, days_format, hours_until, hours_format, minutes_until, minutes_format, hours, minutes)

data = {

"recipient":{ "id": user_id },

"message":{ "text": reply }

}