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ISO Week Number in 2019 Week number according to the ISO-8601 standard, weeks starting on Monday. The first week of the year is the week that contains that year's first Thursday (='First 4-day week'). The highest week number in a year is either 52 or 53. 2019 has 52 weeks. ISO Week Date Day of the Week 1 1-Jan-19 Tuesday 1 2-Jan-19 Wednesday 1 3-Jan-19 Thursday 1 4-Jan-19 Friday 1 5-Jan-19 Saturday 1 6-Jan-19 Sunday 2 7-Jan-19 Monday 2 8-Jan-19 Tuesday 2 9-Jan-19 Wednesday 2 10-Jan-19 Thursday 2 11-Jan-19 Friday 2 12-Jan-19 Saturday 2 13-Jan-19 Sunday 3 14-Jan-19 Monday 3 15-Jan-19 Tuesday 3 16-Jan-19 Wednesday 3 17-Jan-19 Thursday 3 ...