1 Thessalonians 5:1-4 (New International Version)
1 Now, brothers, about times and dates we do not need to write to you, 2 for you know very well that the day of the Lord will come like a thief in the night. 3 While people are saying, "Peace and safety," destruction will come on them suddenly, as labor pains on a pregnant woman, and they will not escape.
4 But you, brothers, are not in darkness so that this day should surprise you like a thief.
this scripture shows while the people will be caught by surprised God's people will be in expectation of armageddon. they will read the signs correctly and be in readiness and not be surprised by the 'thief'
1 Peter 10,11
10 Concerning this salvation, the prophets sought and searched diligently, who prophesied of the grace that would come to you, 11 searching for who or what kind of time the Spirit of Christ, which was in them, pointed to, when he predicted the sufferings of Christ, and the glories that would follow them.
Here clearly shows God's people tried to put time on things did this make them false prophets? does it show making dates is forbidden? Nope it just shows God's people do this and just won't be given the time however much they may look. it is not forbidden and You could argue looking for dates is a sign of God's people by their eagerness.