The Astronomical New Moon is on Friday 05 April 2019 at 07:50 am. The crescent will not be visible on this day.
The calculations for crescent visibility on Saturday 06 April 2019 for London are as follows:
Moonset 08:56 pm
Crescent age 33 hours 53 minutes
Crescent altitude 19.29 degrees
Crescent elongation 16.59 degrees
The crescent will be easily visible with naked eye
1st Shaaban 1440AH will be on Sunday 07 April 2019.