What is the first day of the week in crontab? So we know that the fifth column in crontab means day of the week. But what day is considered as 1? What is considered the first day of the week? Is it Sunday or Monday?

Sunday is 0, Monday is 1, etc.

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The time and date fields are:

field allowed values
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...
day of week 0-7 (0 or 7 is Sunday, or use names)