gestrig
yesterday's
Refers to the previous day, the day before today.
Die gestrige Zeitung liegt noch auf dem Küchentisch.
Yesterday's newspaper is still lying on the kitchen table.

yesterday's / outdated
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yesterday's
Refers to the previous day, the day before today.
Die gestrige Zeitung liegt noch auf dem Küchentisch.
Yesterday's newspaper is still lying on the kitchen table.

The adjective 'gestrig' (yesterday's/outdated) is derived directly from the adverb 'gestern' (yesterday). The ending '-ig' turns the point in time into a characteristic.
Ich habe den gestrigen Feiertag sehr genossen.
I really enjoyed yesterday's holiday.
You can recognize the figurative meaning by the fact that 'gestrig' (outdated) refers to something abstract, such as opinions, ideas, or fashion. The literal meaning refers to concrete events or things from a specific day.
Das gestrige Konzert war fantastisch.
Yesterday's concert was fantastic.
In its literal meaning, 'gestrig' (yesterday's) is often combined with newspapers, events, or periods of time. Typical examples are 'der gestrige Tag' (yesterday), 'die gestrige Besprechung' (yesterday's meeting), or 'das gestrige Abendessen' (yesterday's dinner).
Die Ergebnisse der gestrigen Wahl werden heute bekannt gegeben.
The results of yesterday's election will be announced today.
In its figurative meaning, 'gestrig' (outdated) is always a negative evaluation. It expresses that an attitude or style no longer fits the present day and is obsolete.
Diese Frisur wirkt ein wenig gestrig.
This hairstyle looks a little outdated.
today's / present-day
'heutig' and 'gestrig' are opposites when talking about days: 'heutig' means 'of today', and 'gestrig' means 'of yesterday'. But both can also be understood more broadly. 'heutig' can belong to the present time, while 'gestrig' sometimes means that something is outdated or no longer in keeping with the times. Learners may confuse the words because both are formed in a similar way and often come before nouns. Remember: 'heutig' points to today or the present, while 'gestrig' points to yesterday or to something outdated.

Bei der Arbeit spricht sie noch über die gestrige Besprechung.
At work, she is still talking about yesterday's meeting.
Die heutige Trainingseinheit beginnt wegen des Wetters in der Halle.
Today's training session will start in the gym because of the weather.