Past Contest: challenge end date is incorrect

[SathyaJayabal]

Challenge end date is incorrect in past challenges bucket

cc @sushilshinde

example:
https://beta-community-app.topcoder.com/challenges/51fd9389-d208-4268-a0ef-347ec4928b6f
https://www.topcoder.com/challenges/30133400

[SathyaJayabal]

we have a lot of invalid dates too

[rootelement]

I just saw this as well. But the data looks correct to me. Not sure what property it's keying off of...