Please tell me about the algorithm of U.S. immigration expiration date

The latest US family-based immigration schedule for February 2010

The family-based immigration schedule for mainland China

First priority F1: June 1, 2004 Date (unmarried adult children of U.S. citizens)

Second A priority F2A: March 1, 2006 (spouse and minor children of U.S. residents)

Second B priority F2B: 2002 January 1, 2001 (unmarried adult children of U.S. residents)

Third priority F3: May 22, 2001 (married children of U.S. citizens)

Fourth priority F4: 1999 November 15, 2010 (brothers and sisters who are US citizens)

Analysis: Compared with January 2010, the F1 schedule has advanced by 2 months (January is: April 1, 2004); F2A The scheduling is advanced by 2 months (January is: January 1, 2006); the F2B scheduling is advanced by one month (January is: December 1, 2001); the F3 scheduling remains unchanged (January is: 2001) May 22nd); F4 waiting period is 45 days forward (January is: October 1, 1999)

The latest US employment-based immigration waiting list for February 2010:

First priority: All places are available

Second priority: All over the world are available; Mainland China on May 22, 2005

Third priority: All over the world on September 22, 2002 ; Mainland China, September 22, 2002

Third priority for unskilled workers: Worldwide 01JUN01; Mainland China, June 1, 2001 Tongling Education Network

Fourth priority: All have quotas

Fourth priority: Persons of specific religions: All have quotas

Fifth priority: All have quotas

Fifth priority regional projects: All have quotas

Good luck