bug#54916: 4 invalid dates reported by "date"

[Paul Eggert]

On 4/13/22 06:30, Martins Ozolins via GNU coreutils Bug Reports wrote:

    ozoma@ozoma-ThinkPad-X250:$ date +%s --date="1981-04-01"
    date: invalid date ‘1981-04-01’

This is because your invocation is equivalent to:

date +%s --date="1981-04-01 00:00:00"

and there was no midnight at that date in Latvia.