Today, I received a mail from Steam and noticed that there was no preposition before the date. This is the part of the mail:
SPECIAL PROMOTION! Offer ends 26 Apr 2:00am KST
Shouldn't it be:
SPECIAL PROMOTION! Offer ends on 26 Apr at 2:00am KST
If it's okay to omit the prepositions before a date, are these sentences grammatically correct:
The gift will arrive 26 Apr 2:00am KST.
He sent the message 26 Apr 2:00am KST.
It happens every Monday 2:00am KST.