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days ahead of time vs days in advance

Both "days ahead of time" and "days in advance" are correct phrases that can be used interchangeably to refer to a period of time before an event or deadline. Both are commonplace English phrases that express the same idea.
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Explained by Gregg
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Last updated: March 22, 2025 • 5469 views

This phrase is correct and commonly used in English to refer to a period of time before an event or deadline.

"days ahead of time"

This phrase is used to indicate a specific number of days before a particular event or deadline.

Examples:

  • Please submit your report three days ahead of time.
  • She always plans her vacations days ahead of time.
  • So we went to Tiburon, after three months, and the team had gotten together the week before, many days ahead of time.
  • For the day-ahead market time-frame, the capacity calculation shall be based on the latest available information.
  • The day-ahead market gate closure time in each bidding zone shall be noon market time day-ahead.
  • The day-ahead market gate opening time shall be at the latest 11:00 market time day-ahead.
  • The time limit for delivering information shall be no later than 15.30 market time day-ahead.
  • The information update for the day-ahead market time-frame shall not start before 15:00 market time two days before the day of delivery.
  • For the day-ahead market time-frame and intraday market time-frame the approach used in the common capacity calculation methodologies shall be a flow-based approach, except where the requirement under paragraph 7 is met.
  • If a coordinated capacity calculator is unable to provide for cross-zonal capacity and allocation constraints one hour prior to the day-ahead market gate closure time, that coordinated capacity calculator shall notify the relevant NEMOs.
  • Market participants shall submit all orders to the relevant NEMOs before day-ahead market gate closure time, in accordance with Articles 39 and 40.
  • be compatible across the day-ahead and intraday market time-frames; and
  • Capacity should be allocated in the day-ahead and intraday market time-frames using implicit allocation methods, in particular methods which allocate electricity and capacity together.
  • 'day-ahead market time-frame' means the time-frame of the electricity market until the day-ahead market gate closure time, where, for each market time unit, products are traded the day prior to delivery;
  • By 16 months after the entry into force of this Regulation, all TSOs shall develop a common proposal for a single day-ahead firmness deadline, which shall not be shorter than half an hour before the day-ahead market gate closure time.
  • Capacity calculation for the day-ahead and intraday market time-frames should be coordinated at least at regional level to ensure that capacity calculation is reliable and that optimal capacity is made available to the market.
  • 'day-ahead market gate closure time' means the point in time until which orders are accepted in the day-ahead market;
  • The advance scouts travel a day ahead of the main force, so we still have time.
  • Lisa, your brother has a big day ahead of him.
  • I have a busy day ahead of me.
  • You still have the entire day ahead of you.
  • You've a big day ahead of you tomorrow.

Alternatives:

  • days in advance
  • days before the deadline
  • days prior to the event
  • days beforehand
  • days before

This phrase is correct and commonly used in English to refer to a period of time before an event or deadline.

"days in advance"

This phrase is used to indicate a specific number of days before a particular event or deadline.

Examples:

  • Make sure to book your tickets several days in advance.
  • The meeting was scheduled three days in advance.
  • Nowadays a critic views a film several days in advance.
  • She likes to know 3 days in advance so she can order the rabbit.
  • Enter transactions this number of days in advance
  • The palu also had an uncanny ability to forecast weather conditions days in advance.
  • This particular drama is always played out three days in advance of a European Council summit.
  • The measures include an obligation on foreign investors wishing to acquire an Italian company to obtain approval from the government 60 days in advance.
  • Member States shall publish the rules they have decided to make obligatory at least eight days in advance of their entry into force.
  • This Agreement may be terminated by either Party at any time following written notification not less than 90 days in advance of the proposed termination date.
  • The notification should be made at least 30 days in advance to allow a real market monitoring.
  • The vessel owners concerned shall notify the competent authorities ten days in advance of the date and port selected for taking the observers on board.
  • Member States shall publish the rules they have decided to make obligatory at least eight days in advance of their entry into force.
  • Invitations to special sessions shall be issued not less than forty days in advance of the date fixed for the opening of the session.
  • I'll announce the category two days in advance of each competition day in front of all of you.
  • Certified copies of the text of any amendment proposed shall be prepared by the Director-General and communicated by him to all Members at least ninety days in advance of its consideration by the Assembly.
  • Doesn't that make more sense to set that up days in advance?
  • Any party may propose an amendment to this Agreement by providing to the depositary the text of a proposed amendment at least 60 days in advance of a meeting of the parties.
  • Any NGO desiring to participate as an observer in a meeting of the parties shall notify the Director of its desire to participate at least 50 days in advance of the meeting.
  • If the software patents A item was not put on the agenda at least 14 days in advance of the Council meeting, did not a single Member State ask for it to be removed from the list of A items? 3.
  • Alternatively, Member States delivering assistance may notify the Sanctions Committee at least five days in advance, in consultation with the Federal Government of Somalia, in accordance with paragraph 3 and 4 of UNSCR 2142 (2014).
  • they notify the other Member States ten days in advance of such activities; and

Alternatives:

  • days ahead of time
  • days before the deadline
  • days prior to the event
  • days beforehand
  • days before

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