On H-1 approval notice, there is validity dates which starting date may be different, in such case it is usually later than "From" on I-129.
回複:回複:Part 5, Item 8 - 回複:H1申請中有無H1生效日期這一項?
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                    回複:回複:回複:Part 5, Item 8 - 回複:H1申請中有無H1生效日期這一項?
                     -wxyzwxyz- 
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                        03/26/2008 postreply
                                                08:47:41
                    
                    
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                    Better to make correction - 回複:Part 5, Item 8 - 回複:H1申請中有無H1生效日期
                     -pjiang- 
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                        03/26/2008 postreply
                                                09:12:36
                    
                    
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                    回複:Better to make correction - 回複:Part 5, Item 8 - 回複:H1申請中有無H1生
                     -wxyzwxyz- 
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                        03/26/2008 postreply
                                                09:26:15
                    
                    
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                    The validity dates can't be retroactive upon approval - 回複:Bette
                     -pjiang- 
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                        03/26/2008 postreply
                                                09:33:01