dered meaningless. See Coker v. Coker, 650 S.W.2d 391, 893 (Tex.1983). Every clause of an instrument is intended to have some effect. See Westwind Exploration, Inc. v. Homestate Sav. Ass’n, 696 S.W.2d 378, 382 (Tex.1985). A reasonable interpretation of an agreement will be preferred to one which is unreasonable. See id. The court should adopt the construction of the instrument placed upon it by the parties unless there is clear language in the instrument indicating an intention to the contrary. See Harris v. Rowe, 593 S.W.2d 303, 306 (Tex.1979). If a contract is susceptible to two constructions, one of which would render it valid and the other invalid, construction validating it must prevail. Id.; Dahlberg v. Holden, 150 Tex. 179,183, 238 S.W.2d 699, 701 (1951). We give the language of the contract its plain meaning unless to do so would defeat the parties’ intention. DeWitt, 1 S.W.3d at 101.
If the language in a contract can be given a certain or definite meaning, it is not ambiguous, and we are obligated to interpret the contract as a matter of law. DeWitt County Elec. Co-op., Inc. v. Parks, 1 S.W.3d 96, 100 (Tex.1999). An ambiguity does not arise merely because the parties to an agreement advance differing interpretations. See Lopez v. Munoz, Hockema & Reed, 22 S.W.3d 857, 861 (Tex.2000). The contract is ambiguous only if the application of established rules of construction leaves an agreement susceptible to more than one reasonable meaning. DeWitt County, 1 S.W.3d at 100; Lopez, 22 S.W.3d at 861.
When, as in this case, the contract is unambiguous, we apply the pertinent rules of construction and enforce the contract as written. City of Austin v. Houston Lighting & Power Co., 844 S.W.2d 773, 783 (Tex.App.-Dallas 1992, writ denied); see Lopez, 22 S.W.3d at 862; Heritage Resources, Inc. v. NationsBank, 939 S.W.2d 118, 121 (Tex.1996). We construe the contract by giving the terms their plain, ordinary, and generally accepted meaning unless the instrument shows that the parties used them in a technical or different sense. See Heritage Resources, Inc., 939 S.W.2d at 121. Because the contract is unambiguous, we do not ask about the subjective intent of the parties to the contract. See City of Pinehurst v. Spooner Addition Water Co., 432 S.W.2d 515, 518 (Tex.1968) (if contract unambiguous, parties’ objective, not subjective, intent controls). We simply apply the plain meaning of the contract language. Reilly v. Rangers Mgmt., Inc., 727 S.W.2d 527, 529 (Tex.1987); Spooner, 432 S.W.2d at 518.
The provision at issue here is not ambiguous. Applying the plain meaning of the contract language, the Bank was required to (1) assume all months have 30 days, regardless of the actual number of days in each month; (2) assume each year has 360 days, regardless of the actual number of days in each year; (3) assume each payment is received on the last day of the billing cycle, regardless of when the payment is actually received, even if received early; and (4) assume the daily periodic rate for the account is constant. The trial court concluded, and we agree, that this language required the application of the scheduled installment earnings method of accounting. Even had the trial court been in error in so construing the contract, however, we would hold such error to be harmless in light of the failure of the Vincents to establish damages in connection with the breach of this provision. We resolve the Bank’s cross issue number two against it.
Attorneys’ Fees
In issue number four, the Vincents seek a remand of this case for determination of