jinja_filters.py

from datetime import datetime

def pretty_date(time=False):
	# "time" should be in UTC
	now = datetime.utcnow()
	if type(time) is int:
		diff = now - datetime.fromtimestamp(time)
	elif isinstance(time,datetime):
		diff = now - time
	elif not time:
		diff = now - now
	second_diff = diff.seconds
	day_diff = diff.days

	if day_diff < 0:
		return ''

	if day_diff == 0:
		if second_diff < 10:
			return "just now"
		if second_diff < 60:
			return str(second_diff) + " seconds ago"
		if second_diff < 120:
			return "a minute ago"
		if second_diff < 3600:
			return str(second_diff / 60) + " minutes ago"
		if second_diff < 7200:
			return "an hour ago"
		if second_diff < 86400:
			return str(second_diff / 3600) + " hours ago"
	if day_diff == 1:
		return "Yesterday"
	if day_diff < 7:
		return str(day_diff) + " days ago"
	if day_diff < 31:
		return str(day_diff / 7) + " weeks ago"
	if day_diff < 365:
		return str(day_diff / 30) + " months ago"
	return str(day_diff / 365) + " years ago"

def supress_none(value):
	if value is not None:
		return value
	else:
		return ''

def none_to_zero(value):
	if value is not None:
		return value
	else:
		return 0