Code snippet to calculate exact date-time from a text using date-time denoted numbers(1,2,3,4...) and words('week', 'a week', 'day', 'hour') . Applied for some social media posts texts which denotes time such as "1 hour ago" , '3 weeks ago' etc

date_time_parse_from_few_social_media_post_cases.py

from datetime import datetime, timedelta
import re


'''
examples cases:
4 DAYS AGO
1 HOUR AGO
Listed 4 days ago in East Wenatchee, WA
Listed a week ago in East Wenatchee, WA
Listed an hour ago in East Wenatchee, WA
Listed 2 weeks ago in East Wenatchee, WA
'''

# txt_with_dt = "Listed a hours ago in East Wenatchee, WA"
txt_with_dt = "Listed 4 HOURS ago in East Wenatchee, WA"

def process_time(txt_with_dt):
    return [s for s in txt_with_dt.lower().split() if s.isdigit() or s == 'a' or s == 'an'][0]


def timestamp_formatter(txt_with_dt):

  if re.search("hour", txt_with_dt.lower()):
      hours = process_time(txt_with_dt)
      # for utc time use datetime.utcnow()
      d = datetime.now() - timedelta(hours=int(hours) if hours.isdigit() else 1)
      return d.strftime('%Y-%m-%d %H:%M:%S')

  if re.search("week", txt_with_dt.lower()):
      week = process_time(txt_with_dt)
      d = datetime.now() - timedelta(weeks=int(week) if week.isdigit() else 1)
      return d.strftime('%Y-%m-%d %H:%M:%S')

  if re.search("day", txt_with_dt.lower()):
      day = process_time(txt_with_dt)
      d = datetime.now() - timedelta(days=int(day) if day.isdigit() else 1)
      return d.strftime('%Y-%m-%d %H:%M:%S')

print(timestamp_formatter(txt_with_dt))

# output 
# 2020-11-28 09:42:39