How would I know if my 4 wk old baby has colic?

sounds just like the colic my daughter had. Wonder why evening is preferred time? Started at 1-2 months age, went on for 1-2 months then stopped. Like you nothing worked, we rocked, drove, walked in the stroller etc etc etc. By the time we were at wits end in the evening it was time for final feed of the day and the good news is that she slept really well overnight.