months = ["January", "February", "March", "April", "May", "June", "July",
          "August", "September", "October", "November", "December"]

USE_24HR_TIME = False

def time_transform(val):
#   val is in format '2021-03-25T20:07:39.402Z'

    dstStart = {2021: 14, 2022: 13, 2023: 12, 2024: 10, 2025: 9, 2026: 8, 2027: 14, 2028: 12, 2029: 11, 2030: 10, 2031: 9}

    dstStop = {2021: 7, 2022: 6, 2023: 5, 2024: 3, 2025: 2, 2026: 1, 2027: 7, 2028: 5, 2029: 4, 2030: 3, 2031: 2}

    if val == None:
        val = "When: Unavailable"
    year = int(val[0:4])
    month = int(val[5:7])
    day = int(val[8:10])
    hour = int(val[11:13]) # hour is in UTC
    if month in range(3, 12):
        if month == 3 and day >= int(dstStart[year])+1 or month == 3 and day == int(dstStart[year]) and hour >= 7:
            timezoneOffset = 4
            
        elif month == 11 and day <= int(dstStop[year]):
            if day <= int(dstStop[year])-1 or day == int(dstStop[year]) and hour <= 6:
                timezoneOffset = 4
            else:
                timezoneOffset = 5

        elif month in range(4,11):
            timezoneOffset = 4
        else:
            timezoneOffset = 5
        
    else:
        timezoneOffset = 5
        
    hour = hour - timezoneOffset
    if hour < 0:
        hour = hour + 24
        day = day -1
    min = int(val[14:16])

    if USE_24HR_TIME:
        timestring = "%d:%02d" % (hour, min)
    elif hour > 12:
        timestring = "%d:%02d pm" % (hour-12, min)
    else:
        timestring = "%d:%02d am" % (hour, min)

    return "%s %d, %d, at %s" % (months[month-1], day, year, timestring)
testval = '2021-11-07T08:00:39.402Z'
print(testval)
print(time_transform(testval))