txid-time.py

#!/usr/bin/python
import sys
import time

def get_trans_id_time(trans_id):
    if len(trans_id) >= 34 and trans_id[:2] == 'tx' and trans_id[23] == '-':
        try:
            return int(trans_id[24:34], 16)
        except ValueError:
            pass
    return None

t = get_trans_id_time(sys.argv[1])
print t, time.asctime(time.gmtime(t))