Chief Justice Burger
delivered the opinion of the Court.
We granted certiorari to resolve a conflict in the Circuits1 as to whether (a) the Speedy Trial Act of 1974, 18 U. S. C. § 3161 et seq., as amended, prohibits commencement of a trial less than 30 days after arraignment on a superseding indictment; and (b) assuming a violation of the Speedy Trial Act in this case, was that error harmless?
I
On December 7, 1981, respondent, who is not a citizen of the United States, was convicted of illegal entry into this country and was sentenced to one year’s imprisonment. After serving his sentence, respondent returned to Mexico.
Again, on February 13, 1983, he entered the United States illegally and was apprehended by United States Border [233]*233Patrol agents. On February 18, 1983, a federal grand jury sitting in the Southern District of California returned a two-count indictment charging respondent with felony illegal entry under 8 U. S. C. § 1325 and with reentry by a deported alien under 8 U. S. C. § 1326. The indictment stated that the judgment of conviction for the prior illegal entry, which formed the predicate for the enhancement of the § 1325 offense to a felony, was “rendered on or about December 17, 1981.” The date of the previous conviction was actually December 7, 1981. On February 18, 1983, respondent, appearing through counsel, was arraigned on the indictment. Trial was set for April 19, 1983.
On March 21, 1983, the Government informed respondent of the correct date of the previous conviction, and on April 15, 1983, the grand jury returned a superseding indictment which was identical with the original indictment in all respects except that it stated that the date of the previous conviction was “on or about December 7, 1981.”2 Respondent was arraigned on the superseding indictment on April 18, 1983.
Later that day at a pretrial conference, respondent’s counsel moved for a 30-day continuance of the trial scheduled to begin the next day contending that the Speedy Trial Act, as construed by the Court of Appeals for the Ninth Circuit in United States v. Arkus, 675 F. 2d 245 (1982), required that a new 30-day trial preparation period be granted following the return of a superseding indictment.3 The District Court denied respondent’s motion for a 30-day continuance, citing the Seventh Circuit’s decision in United States v. Horton, 676 [234]*234F. 2d 1165 (1982), and distinguishing Arkus. Respondent was convicted of felony illegal entry into the United States.
The Court of Appeals reversed, holding that under its decision in United States v. Harris, 724 F. 2d 1452 (CA9 1984), which in turn relied on its decision in Arkus, respondent was entitled to a new 30-day trial preparation period following his arraignment on the superseding indictment. Citing its decision in United States v. Daly, 716 F. 2d 1499 (CA9 1983), the Court of Appeals held that reversal of respondent’s conviction was required to remedy the Speedy Trial Act violation because “any pretrial preparation period shorter than thirty days is inadequate per se. No showing of prejudice is required.”
We granted certiorari, 469 U. S. 1207 (1985). We reverse.
II
Our starting point, of course, is the language of the statute. The Speedy Trial Act of 1974, as amended in 1979, 18 U. S. C. §3161 et seq., establishes inside and outside time limits for commencing trial in criminal cases. Section 3161(c)(2), the provision at issue in this case, provides:
“Unless the defendant consents in writing to the contrary, the trial shall not commence less than thirty days from the date on which the defendant first appears through counsel or expressly waives counsel and elects to proceed pro se” (emphasis added).
The statute clearly fixes the beginning point for the trial preparation period as the first appearance through counsel. It does not refer to the date of the indictment, much less to the date of any superseding indictment. Given this unambiguous language, we have no choice but to conclude that Congress did not intend that the 30-day trial preparation period begin to run from the date of filing of a superseding indictment.
[235]*235That conclusion finds additional support in the language of § 3161(c)(1). That section establishes the outside time limit within which trial must commence under the Act and explicitly refers to the date of the indictment as one of the relevant dates for determining that time limit:
“[T]he trial of a defendant charged in an information or indictment with the commission of an offense shall commence within seventy days from the filing date (and making public) of the information or indictment, or from the date the defendant has appeared before a judicial officer of the court in which such charge is pending, whichever date last occurs” (emphasis added).
It is clear that Congress knew how to provide for the computation of time periods under the Act relative to the dáte of an indictment. Had Congress intended that the 30-day trial preparation period of § 3161(c)(2) commence or recommence on such a date, it would have so provided.
Because the language of § 3161(c)(2) is a clear expression of congressional intent, we need not resort to the legislative history of that section. We note, however, that the legislative history is wholly consistent with our reading of that section. The 30-day trial preparation period was not included in the original Speedy Trial Act as it was enacted in 1975 but was incorporated into the Act with the 1979 amendments to the Act. Speedy Trial Act Amendments Act of 1979, Pub. L. 96-43, 93 Stat. 327. The legislative history of the 1979 revisions suggests that the source of the 30-day trial preparation period was a set of Guidelines issued by the Judicial Council of the United States Court of Appeals for the Second Circuit. See Hearings on S. 961 and S. 1028 before the Senate Committee on the Judiciary, 96th Cong., 1st Sess., 122, 386-436 (1979). The Guidelines were issued to assist the trial judges sitting in the Second Circuit in interpreting the provisions of the Act. Id., at 386. These Guidelines provided that “whenever the time between arraignment and the scheduled trial date does not exceed thirty (30) days, [236]*236the Court shall. . . view a request for an adjournment of trial to a date beyond thirty (30) days but within the sixty (60) day limit, liberally . . . Id., at 392-393. The Guidelines also stated that, in the situation where a superseding indictment adds new charges, trial of the original charges must begin “within the time limit for commencement of trial on the original indictment or information.” Id., at 417.
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Chief Justice Burger
delivered the opinion of the Court.
We granted certiorari to resolve a conflict in the Circuits1 as to whether (a) the Speedy Trial Act of 1974, 18 U. S. C. § 3161 et seq., as amended, prohibits commencement of a trial less than 30 days after arraignment on a superseding indictment; and (b) assuming a violation of the Speedy Trial Act in this case, was that error harmless?
I
On December 7, 1981, respondent, who is not a citizen of the United States, was convicted of illegal entry into this country and was sentenced to one year’s imprisonment. After serving his sentence, respondent returned to Mexico.
Again, on February 13, 1983, he entered the United States illegally and was apprehended by United States Border [233]*233Patrol agents. On February 18, 1983, a federal grand jury sitting in the Southern District of California returned a two-count indictment charging respondent with felony illegal entry under 8 U. S. C. § 1325 and with reentry by a deported alien under 8 U. S. C. § 1326. The indictment stated that the judgment of conviction for the prior illegal entry, which formed the predicate for the enhancement of the § 1325 offense to a felony, was “rendered on or about December 17, 1981.” The date of the previous conviction was actually December 7, 1981. On February 18, 1983, respondent, appearing through counsel, was arraigned on the indictment. Trial was set for April 19, 1983.
On March 21, 1983, the Government informed respondent of the correct date of the previous conviction, and on April 15, 1983, the grand jury returned a superseding indictment which was identical with the original indictment in all respects except that it stated that the date of the previous conviction was “on or about December 7, 1981.”2 Respondent was arraigned on the superseding indictment on April 18, 1983.
Later that day at a pretrial conference, respondent’s counsel moved for a 30-day continuance of the trial scheduled to begin the next day contending that the Speedy Trial Act, as construed by the Court of Appeals for the Ninth Circuit in United States v. Arkus, 675 F. 2d 245 (1982), required that a new 30-day trial preparation period be granted following the return of a superseding indictment.3 The District Court denied respondent’s motion for a 30-day continuance, citing the Seventh Circuit’s decision in United States v. Horton, 676 [234]*234F. 2d 1165 (1982), and distinguishing Arkus. Respondent was convicted of felony illegal entry into the United States.
The Court of Appeals reversed, holding that under its decision in United States v. Harris, 724 F. 2d 1452 (CA9 1984), which in turn relied on its decision in Arkus, respondent was entitled to a new 30-day trial preparation period following his arraignment on the superseding indictment. Citing its decision in United States v. Daly, 716 F. 2d 1499 (CA9 1983), the Court of Appeals held that reversal of respondent’s conviction was required to remedy the Speedy Trial Act violation because “any pretrial preparation period shorter than thirty days is inadequate per se. No showing of prejudice is required.”
We granted certiorari, 469 U. S. 1207 (1985). We reverse.
II
Our starting point, of course, is the language of the statute. The Speedy Trial Act of 1974, as amended in 1979, 18 U. S. C. §3161 et seq., establishes inside and outside time limits for commencing trial in criminal cases. Section 3161(c)(2), the provision at issue in this case, provides:
“Unless the defendant consents in writing to the contrary, the trial shall not commence less than thirty days from the date on which the defendant first appears through counsel or expressly waives counsel and elects to proceed pro se” (emphasis added).
The statute clearly fixes the beginning point for the trial preparation period as the first appearance through counsel. It does not refer to the date of the indictment, much less to the date of any superseding indictment. Given this unambiguous language, we have no choice but to conclude that Congress did not intend that the 30-day trial preparation period begin to run from the date of filing of a superseding indictment.
[235]*235That conclusion finds additional support in the language of § 3161(c)(1). That section establishes the outside time limit within which trial must commence under the Act and explicitly refers to the date of the indictment as one of the relevant dates for determining that time limit:
“[T]he trial of a defendant charged in an information or indictment with the commission of an offense shall commence within seventy days from the filing date (and making public) of the information or indictment, or from the date the defendant has appeared before a judicial officer of the court in which such charge is pending, whichever date last occurs” (emphasis added).
It is clear that Congress knew how to provide for the computation of time periods under the Act relative to the dáte of an indictment. Had Congress intended that the 30-day trial preparation period of § 3161(c)(2) commence or recommence on such a date, it would have so provided.
Because the language of § 3161(c)(2) is a clear expression of congressional intent, we need not resort to the legislative history of that section. We note, however, that the legislative history is wholly consistent with our reading of that section. The 30-day trial preparation period was not included in the original Speedy Trial Act as it was enacted in 1975 but was incorporated into the Act with the 1979 amendments to the Act. Speedy Trial Act Amendments Act of 1979, Pub. L. 96-43, 93 Stat. 327. The legislative history of the 1979 revisions suggests that the source of the 30-day trial preparation period was a set of Guidelines issued by the Judicial Council of the United States Court of Appeals for the Second Circuit. See Hearings on S. 961 and S. 1028 before the Senate Committee on the Judiciary, 96th Cong., 1st Sess., 122, 386-436 (1979). The Guidelines were issued to assist the trial judges sitting in the Second Circuit in interpreting the provisions of the Act. Id., at 386. These Guidelines provided that “whenever the time between arraignment and the scheduled trial date does not exceed thirty (30) days, [236]*236the Court shall. . . view a request for an adjournment of trial to a date beyond thirty (30) days but within the sixty (60) day limit, liberally . . . Id., at 392-393. The Guidelines also stated that, in the situation where a superseding indictment adds new charges, trial of the original charges must begin “within the time limit for commencement of trial on the original indictment or information.” Id., at 417. Taking these two statements from the Guidelines together, it appears that, although the Second Circuit was clearly concerned that a defendant be given a pretrial preparation period of at least 30 days, the filing of a superseding indictment was not enough by itself to require the restarting of that 30-day period.
Applying § 3161(c)(2) to the facts of this case, we conclude that the requirements of that section were met here. The record reflects that respondent’s first appearance through counsel occurred on February 18, 1983. Trial was not commenced until April 19, 1983. Respondent was, therefore, afforded a pretrial preparation period twice as long as the minimum required by § 3161(c)(2).
In concluding as we do that the Act does not require that the 30-day trial preparation period be restarted upon the filing of a superseding indictment, we do not hold that a defendant must always be compelled to go to trial less than 30 days after the filing of such an indictment. The Act itself places broad discretion in the District Court to grant a continuance when necessary to allow further preparation. Section 3161(h)(8) authorizes the trial judge to grant a continuance if “the ends of justice served by taking such action outweigh the best interest of the public and the defendant in a speedy trial.” The authority of the District Court to grant an “ends of justice” continuance should take care of any case in which the Government seeks a superseding indictment which operates to prejudice a defendant.
Here respondent was clearly not prejudiced by the return of the superseding indictment. The initial indictment recited that the judgment on the prior illegal entry had been [237]*237rendered “on or about December 17, 1981.” The superseding indictment did nothing except to correct that phrase to read “on or about December 7, 1981.” Even if we were prepared to hold that December 7 is not “on or about” December 17, we would nevertheless be compelled to conclude that respondent was not prejudiced by the change.
Since the Act did not prohibit the commencement of the trial less than 30 days after arraignment on the superseding indictment, we need not address the question whether the District Court’s refusal to grant the continuance requested by respondent was harmless error.
The Court of Appeals’ construction of the Act ignored its plain language and would frustrate its basic purpose which is manifest in its very title: The speedy trial of criminal cases. That construction was error, and we reverse.
Reversed.