import math import os from datetime import datetime, timezone def parse_datetime(value): """Returns an aware datetime in local timezone""" dttm = datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%f%z") # When running tests return datetime in UTC so that tests don't depend on # the local timezone if "PYTEST_CURRENT_TEST" in os.environ: return dttm.astimezone(timezone.utc) return dttm.astimezone() SECOND = 1 MINUTE = SECOND * 60 HOUR = MINUTE * 60 DAY = HOUR * 24 WEEK = DAY * 7 def time_ago(value: datetime) -> str: now = datetime.now().astimezone() delta = now.timestamp() - value.timestamp() if delta < 1: return "now" if delta < 8 * DAY: if delta < MINUTE: return f"{math.floor(delta / SECOND)}".rjust(2, " ") + "s" if delta < HOUR: return f"{math.floor(delta / MINUTE)}".rjust(2, " ") + "m" if delta < DAY: return f"{math.floor(delta / HOUR)}".rjust(2, " ") + "h" return f"{math.floor(delta / DAY)}".rjust(2, " ") + "d" if delta < 53 * WEEK: # not exactly correct but good enough as a boundary return f"{math.floor(delta / WEEK)}".rjust(2, " ") + "w" return ">1y"