import machine
import time


def datetime():
    dt = machine.RTC().datetime()

    return '{0:04d}-{1:02d}-{2:02d} {4:02d}:{5:02d}:{6:02d} UTC'.format(*dt)


def datetimeISO8601():
    dt = machine.RTC().datetime()

    return '{0:04d}-{1:02d}-{2:02d}T{4:02d}:{5:02d}:{6:02d}Z'.format(*dt)


def secondsElapsed(ticks1, ticks2):
    return time.ticks_diff(ticks1, ticks2) / 1000