Returns the relative time (also known as 'time ago') based on the given datetime object input.

GetRelativeTime.py

from datetime import datetime
from math import floor

def get_relative_time(dateTime):
    current_time = datetime.utcnow()
    time_diff = current_time - dateTime

    intervals = (
        (time_diff.days / 36500, "century", "centuries"),
        (time_diff.days / 3650, "decade", "decades"),
        (time_diff.days / 365, "year", "years"),
        (time_diff.days / 30, "month", "months"),
        (time_diff.days / 7, "week", "weeks"),
        (time_diff.days, "day", "days"),
        (time_diff.seconds / 3600, "hour", "hours"),
        (time_diff.seconds / 60, "minute", "minutes"),
        (time_diff.seconds, "second", "seconds"),
    )

    for i, s, p in intervals:
        time_ago = floor(i)
        if time_ago:
            # Singular if the returned floor value is 1, plural otherwise
            return f"{time_ago} {s if time_ago == 1 else p} ago"

    return "Just now"