The sad thing is that many parishes in my diocese have been doing this for quite some time. The earliest one has scheduled their Easter Vigil is 5:30PM; two of them have it at 7:00PM. We waited until dark.
The bishop was made aware of the problem in January and was given the appropriate citation from Paschale Solemnitatis; but, nothing happened.
Now, regarding your original question, inasmuch as Lent ended on Holy Thursday, PS adds this interesting citation:
- The greatest mysteries of the redemption are celebrated yearly by the Church beginning with the evening Mass of the Lord’s Supper on Holy Thursday and ending with Vespers of Easter Sunday. This time is called “the triduum of the crucified, buried and risen”;  it is also called the “Easter Triduum” because during it is celebrated the paschal mystery, that is, the passing of the Lord from this world to his Father. The Church, by the celebration of this mystery through liturgical signs and sacramentals, is united to Christ, her spouse, in intimate communion.
- The Easter fast is sacred on the first two days of the Triduum, in which, according to ancient tradition, the Church fasts “because the Spouse has been taken away.”  Good Friday is a day of fasting and abstinence; it is also recommended that Holy Saturday be so observed, so that the Church, with uplifted and welcoming heart, be ready to celebrate the joys of the Sunday of the Resurrection. 
So, even though Lent is over, we still should hold on to our Lenten regimens, at least until after the celebration of the Easter Vigil.